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If you’ve just picked up a 2024 Toyota GR86 or Subaru BRZ, you’re already driving one of the most engaging sports cars on the market. But let’s be honest—you’re probably already thinking about how to make it even better. The good news is that both of these platforms respond incredibly well to modifications, and you don’t need to empty your bank account to see real improvements in performance, handling, and style.
The GR86 and BRZ share the same DNA, built on a lightweight rear-wheel-drive platform with a naturally aspirated boxer engine that loves to rev. While the factory setup is already well-balanced, there’s plenty of room to unlock more power, sharpen handling, and add your own personal touch. Whether you’re chasing lap times at the track or just want a more thrilling daily driver, the right mods can transform how your car feels and performs.
This guide breaks down the most effective upgrades for the 2024 GR86 and BRZ, focusing on modifications that deliver real-world results. We’ll cover everything from engine tuning and forced induction to suspension upgrades, brake improvements, and styling enhancements. Each section is designed to help you make informed decisions based on your driving style, budget, and goals.
Understanding the 2024 GR86 and BRZ Platform
Before diving into specific modifications, it’s worth understanding what makes the second-generation GR86 and BRZ special. Both cars feature a 2.4-liter naturally aspirated flat-four engine producing 228 horsepower and 184 lb-ft of torque. The larger displacement compared to the previous generation provides better low-end torque and a more responsive throttle.
The chassis is stiffer than the first generation, with improved suspension geometry and a lower center of gravity. This creates a platform that’s already well-sorted from the factory, but also one that responds exceptionally well to targeted upgrades. The lightweight construction—around 2,800 pounds—means that even small power gains translate to noticeable performance improvements.
Both cars share the same engine, transmission options, and basic architecture, which means most modifications work equally well on either platform. The main differences come down to suspension tuning and minor styling details, but the aftermarket treats them as essentially the same vehicle.
Engine Tuning and ECU Modifications
One of the most cost-effective ways to improve your GR86 or BRZ is through engine tuning. The factory ECU is programmed conservatively to meet emissions standards and ensure reliability across a wide range of conditions. A proper tune can optimize fuel delivery, ignition timing, and throttle response to extract more performance from the existing hardware.
A quality tune typically adds between 10 and 20 horsepower at the wheels, depending on what other modifications you’ve installed. More importantly, the power curve becomes smoother and more linear, eliminating flat spots and making the engine feel more eager throughout the rev range. Throttle response becomes sharper, and the car feels more connected to your inputs.
There are several approaches to tuning. Off-the-shelf tunes are pre-programmed maps designed for specific modification combinations. These are convenient and affordable, but they’re not optimized for your specific car. Custom tuning involves a professional tuner using a dynamometer to create a map tailored to your vehicle’s exact setup. This approach delivers the best results but costs more and requires access to a skilled tuner.
Popular tuning solutions include OpenFlash Tablet, EcuTek, and Flex Fuel kits that allow you to run E85 ethanol fuel for additional power gains. If you’re planning multiple modifications, it’s smart to save the tune for last, after you’ve installed intake, exhaust, and other supporting mods. This way, the tuner can optimize for your complete setup rather than having to retune multiple times.
Keep in mind that tuning may affect your warranty coverage. Some dealers are more modification-friendly than others, so it’s worth having a conversation with your service department before making changes. Documenting your modifications and working with reputable tuners can help protect you if issues arise.
Forced Induction: Turbochargers and Superchargers
If you’re serious about adding significant power, forced induction is the way to go. Both turbocharger and supercharger kits are available for the 2024 GR86 and BRZ, and they can dramatically transform the driving experience. We’re talking about power gains ranging from 50 to over 150 horsepower, depending on the system and boost levels.
Turbocharger systems use exhaust gases to spin a turbine that compresses incoming air. This approach is efficient and can produce massive power gains, but it typically involves some turbo lag—a delay between pressing the throttle and feeling the boost. Modern turbo kits have minimized this lag considerably, and many drivers appreciate the explosive power delivery once boost builds.
Superchargers are belt-driven, which means they provide instant boost with no lag. The power delivery is linear and predictable, making the car feel like it simply has a much larger engine. The trade-off is that superchargers consume some engine power to operate and can be less efficient than turbos at higher boost levels.
Popular turbo kits for the platform include offerings from companies like HKS, GReddy, and Full-Race. Supercharger options come from manufacturers like Edelbrock and Kraftwerks. Each system has its own characteristics, installation complexity, and price point, typically ranging from $4,000 to $8,000 or more for complete kits.
Forced induction isn’t a simple bolt-on modification. You’ll need supporting modifications to ensure reliability, including a proper tune, upgraded fuel system components, and potentially stronger engine internals if you’re pushing high boost levels. Oil cooling becomes more critical, and you may need to upgrade your clutch if you’re running a manual transmission. Professional installation is strongly recommended unless you have significant mechanical experience.
The reliability question is real. A well-designed forced induction system installed correctly and tuned conservatively can be reliable for daily driving. However, you’re asking more from the engine, which means increased wear and the potential for problems if something goes wrong. Many owners run moderate boost levels—around 6-8 psi—as a sweet spot between power gains and long-term reliability.
Intake and Air Filter Upgrades
Improving airflow into the engine is one of the most straightforward modifications you can make. The factory intake system is reasonably efficient, but aftermarket options can reduce restrictions and bring in cooler, denser air for better combustion.
A high-flow drop-in air filter is the simplest upgrade. These filters replace the factory paper element with a reusable cotton or foam filter that flows more air while still providing adequate filtration. Brands like K&N and AEM offer drop-in filters that install in minutes and cost under $100. Power gains are modest—maybe 2-5 horsepower—but you’ll notice improved throttle response and a slightly more aggressive intake sound.
Cold air intake systems replace the entire intake tract with larger-diameter piping and relocate the filter to draw in cooler air from outside the engine bay. Cooler air is denser, which means more oxygen for combustion and better power output. Quality cold air intakes can add 5-10 horsepower and make the engine sound more aggressive under acceleration.
When choosing an intake, look for systems that include heat shielding to prevent hot engine bay air from being drawn into the intake. Some cheaper systems actually reduce performance by sucking in hot air, which defeats the purpose. Reputable brands like Injen, AEM, and Perrin Engineering design their intakes specifically for the GR86 and BRZ platform with proper heat management.
One consideration is that some intake systems can trigger a check engine light due to changes in airflow readings. Quality systems are designed to avoid this, but it’s worth checking reviews and manufacturer notes before purchasing. Pairing an intake upgrade with a tune maximizes the benefits, as the ECU can be programmed to take full advantage of the improved airflow.
Exhaust System Upgrades
Exhaust modifications are among the most popular upgrades for the GR86 and BRZ, and for good reason. A quality exhaust system reduces backpressure, adds power, cuts weight, and transforms the sound of your car. The boxer engine has a distinctive rumble that really comes alive with the right exhaust setup.
There are several types of exhaust modifications to consider. An axle-back system replaces only the rear section of the exhaust, from the rear axle to the tips. This is the most affordable option, typically costing $400-$800, and it’s easy to install. You’ll get a noticeable sound improvement and maybe 2-5 horsepower, along with some weight savings.
Cat-back exhaust systems replace everything from the catalytic converter back to the tips. These systems offer better flow, more significant power gains (5-15 horsepower), and greater sound improvement. They’re more expensive, usually $800-$1,500, but they provide a more complete upgrade. Quality cat-back systems use mandrel-bent tubing for smooth flow and are constructed from stainless steel or titanium for durability and weight savings.
For maximum performance, a full turbo-back or header-back system replaces the entire exhaust from the engine to the tips, including headers and sometimes high-flow catalytic converters. These setups can add 15-25 horsepower when combined with a tune, but they’re more expensive and may have emissions implications depending on your location.
Popular exhaust brands for the platform include Borla, which offers a refined, deep tone without excessive drone; Invidia, known for aggressive sound and excellent build quality; GReddy, a Japanese brand with a strong motorsports heritage; and Tomei, which produces some of the loudest and most free-flowing systems available. Each brand offers different sound characteristics, so listening to sound clips online before purchasing is highly recommended.
Sound is subjective, but there are some general considerations. If you daily drive your car, excessive drone—that resonant frequency that buzzes through the cabin at cruising speeds—can become tiresome. Many manufacturers design their systems to minimize drone while still providing an aggressive sound under acceleration. If you live in an area with strict noise ordinances or need to pass emissions testing, make sure your chosen system is compliant with local regulations.
Unequal length headers are worth special mention. The boxer engine’s unique layout means that exhaust pulses from each bank can be timed differently, creating that characteristic Subaru rumble. UEL headers enhance this sound while improving exhaust flow. Equal length headers provide better performance but produce a more conventional exhaust note. The choice often comes down to whether you prioritize sound character or maximum power.
Suspension Upgrades for Improved Handling
The GR86 and BRZ are already known for excellent handling, but suspension modifications can take things to another level. Whether you’re looking for better daily driving comfort, sharper turn-in, or track-ready performance, there are suspension options to match your needs.
Lowering springs are an affordable entry point, typically costing $200-$400. They drop the car’s ride height by about an inch, lowering the center of gravity and reducing body roll. The car feels more planted in corners and looks more aggressive. However, springs alone don’t give you adjustability, and the ride quality depends on how well they’re matched to your stock dampers. Quality spring manufacturers like Eibach and H&R design their springs to work with factory shocks for a balanced setup.
Coilover suspension systems replace both springs and dampers with adjustable units that let you fine-tune ride height, damping, and sometimes even spring rates. This is the upgrade serious enthusiasts choose because it offers complete control over suspension characteristics. You can set the car up soft for daily driving and stiffen it up for track days, all with simple adjustments.
Entry-level coilovers from brands like Tein and BC Racing start around $1,000 and offer good performance for street driving and occasional track use. Mid-range options from KW, Öhlins, and Fortune Auto ($1,500-$2,500) provide better damping quality and more precise adjustability. High-end systems from companies like MCS and Penske ($3,000+) are designed for serious track use with remote reservoirs and extensive tuning options.
When choosing coilovers, consider how you’ll use the car. If it’s primarily a street car with occasional spirited driving, you want something comfortable enough for daily use but with enough performance to make driving fun. Track-focused setups can be punishingly stiff on the street. Look for systems with a wide range of damping adjustment so you can dial in the perfect compromise.
Sway bars (also called anti-roll bars) are another effective handling upgrade. They reduce body roll in corners by connecting the left and right sides of the suspension. Upgrading to thicker, stiffer sway bars makes the car feel more responsive and reduces the amount the body leans in turns. Adjustable sway bars let you fine-tune the balance between front and rear grip, which is especially useful if you like to adjust the car’s handling characteristics or if you’re running different tire sizes front and rear.
Chassis bracing and strut tower bars add rigidity to the chassis, reducing flex under hard cornering. While the GR86 and BRZ chassis is already quite stiff, additional bracing can sharpen turn-in response and make the car feel more connected. These are relatively inexpensive upgrades, typically under $200, and they’re easy to install.
Don’t overlook bushings and other suspension components. Upgrading to polyurethane or spherical bushings in key locations reduces deflection and improves suspension response. The trade-off is increased noise and vibration transmission, so this is more of a track-focused modification. Adjustable control arms and camber plates allow for precise alignment settings, which is crucial if you’ve lowered the car or if you’re setting it up for track use.
Brake System Enhancements
The factory brakes on the 2024 GR86 and BRZ are adequate for street driving, but they can fade quickly under hard track use or aggressive mountain driving. Upgrading your brakes improves stopping power, reduces fade, and gives you more confidence when pushing the car hard.
The simplest and most cost-effective brake upgrade is better pads and fluid. High-performance brake pads from companies like Hawk, EBC, or Carbotech offer better bite and higher temperature resistance than factory pads. Different pad compounds are designed for different uses—street pads prioritize low dust and quiet operation, while track pads focus on maximum stopping power and fade resistance at high temperatures.
Brake fluid is often overlooked, but it’s critical for performance. Factory brake fluid has a relatively low boiling point, and when it gets hot, it can boil and create vapor bubbles in the brake lines, leading to a spongy pedal and reduced braking power. High-performance brake fluid like Motul RBF 600 or Castrol SRF has a much higher boiling point and maintains consistent pedal feel even under extreme conditions. This is an inexpensive upgrade—usually under $50—that makes a real difference.
Stainless steel braided brake lines replace the rubber factory lines with lines that don’t expand under pressure. This gives you a firmer, more responsive brake pedal with better modulation. The improvement is noticeable, especially if your factory lines are a few years old and have started to soften. Complete brake line kits cost around $100-$200 and can be installed in a few hours.
For more significant improvements, big brake kits replace the factory calipers, rotors, and sometimes the brake lines with larger, more powerful components. Companies like Brembo, Stoptech, and Wilwood offer kits specifically designed for the GR86 and BRZ. These kits provide dramatically improved stopping power, better heat dissipation, and reduced fade. They’re expensive—typically $2,000-$4,000 or more—but they’re essential if you’re doing regular track days or if you’ve added significant power to the car.
Even without a full big brake kit, upgrading to larger rotors and better calipers can make a difference. Some owners swap in Brembo calipers from other vehicles, like the WRX, which bolt on with minor modifications and provide better clamping force. Slotted or drilled rotors improve heat dissipation and can reduce brake fade, though they wear pads faster than smooth rotors.
One often-overlooked aspect of brake performance is proper bedding. New pads and rotors need to be properly bedded in through a series of controlled stops that transfer a layer of pad material onto the rotor surface. Skipping this process can lead to uneven braking, noise, and reduced performance. Most pad manufacturers provide specific bedding procedures that should be followed carefully.
Wheel and Tire Upgrades
Tires are the single most important performance modification you can make. They’re the only contact point between your car and the road, and they affect acceleration, braking, cornering, and ride quality. Even the best suspension and brake upgrades won’t help if you’re running mediocre tires.
The factory Michelin Primacy tires on the GR86 and BRZ are designed for a balance of comfort, longevity, and all-season capability. They’re fine for daily driving, but they’re not particularly sporty. Upgrading to a high-performance summer tire transforms how the car feels. Options like the Michelin Pilot Sport 4S, Continental ExtremeContact Sport, or Bridgestone Potenza RE-71RS offer dramatically better grip, sharper turn-in, and more feedback.
The factory wheel size is 18×7.5 inches with 215/40R18 tires. Many enthusiasts upgrade to a slightly wider wheel and tire combination, such as 18×8.5 or 18×9 with 225 or 235-width tires. This provides a larger contact patch for better grip without significantly affecting the car’s balance or requiring modifications. Going too wide can actually slow the car down and make it feel less responsive, so there’s a sweet spot to aim for.
Lightweight wheels reduce unsprung weight, which improves suspension response, acceleration, and braking. A quality lightweight wheel can save 3-5 pounds per corner compared to the factory wheels, which adds up to 12-20 pounds of rotating mass. This makes the car feel more agile and responsive. Popular lightweight wheel options include Enkei RPF1, Rays TE37, and Apex ARC-8 wheels.
Wheel fitment is important. You want wheels that fit properly without rubbing on the fenders or suspension components. The GR86 and BRZ have specific offset and width requirements, and going too aggressive with fitment can cause problems. Most enthusiasts stick with offsets between +35 and +45mm for 18-inch wheels, which provides a good stance without issues.
For track use, many drivers run a square setup with the same size wheels and tires at all four corners. This allows for tire rotation and provides balanced handling. Some prefer a staggered setup with wider rear tires for more rear grip, but this can affect the car’s natural balance and make it more prone to understeer.
Aerodynamic Modifications
Aerodynamic upgrades can improve high-speed stability and cornering grip by managing airflow around and under the car. While these modifications are most beneficial at track speeds, they can also enhance the car’s appearance and give it a more aggressive stance.
A rear wing or spoiler generates downforce on the rear axle, pressing the tires into the pavement for better grip. The factory GR86 and BRZ come with a small ducktail spoiler, but aftermarket wings can produce significantly more downforce. Adjustable wings let you tune the amount of downforce based on your needs. Companies like APR Performance, Voltex, and Verus Engineering offer wings specifically designed for the platform with proven aerodynamic benefits.
Front splitters and air dams increase front downforce and help balance out rear wing downforce. They also reduce lift at the front of the car, improving high-speed stability. A properly designed splitter directs air around the car rather than underneath it, reducing drag and improving efficiency. Some splitters are aggressive and sit very low, which can be problematic for street driving with speed bumps and steep driveways.
Side skirts and diffusers manage airflow along the sides and underneath the rear of the car. A rear diffuser accelerates air coming out from under the car, creating a low-pressure area that effectively sucks the car down onto the road. These components work together as a system, so adding just one piece may not provide the balanced results you’re looking for.
It’s worth noting that functional aerodynamics and cosmetic add-ons are not the same thing. Many inexpensive body kits are designed purely for looks and may actually hurt aerodynamic performance. If you’re serious about aero, look for components that have been tested in wind tunnels or on track, and consider consulting with someone who understands aerodynamic principles.
Exterior Styling Modifications
Beyond performance, many owners want to personalize the appearance of their GR86 or BRZ. Styling modifications let you make the car uniquely yours and can range from subtle enhancements to dramatic transformations.
Front lips and side skirts add visual aggression and can make the car appear lower and wider. Many are made from flexible polyurethane or ABS plastic, which can withstand minor scrapes without cracking. Carbon fiber options are available for those who want the weight savings and premium appearance, though they’re more expensive and less forgiving of impacts.
Mud flaps and splash guards like Rally Armor or Rokblokz protect the paint from rock chips and road debris. They’re especially useful if you drive on gravel roads or in areas with harsh winters. They add a rally-inspired look that many enthusiasts appreciate, and they’re functional as well as stylish.
Vinyl wraps offer a way to completely change your car’s color without the permanence and expense of a full paint job. Wraps can be removed if you change your mind or want to return the car to stock before selling. They also protect the factory paint underneath. Professional installation is recommended for the best results, though skilled DIYers can tackle it themselves with patience.
Window tinting improves privacy, reduces interior heat, and gives the car a sleeker appearance. Most states have laws regulating how dark you can tint your windows, so check local regulations before going too dark. Ceramic tints offer the best heat rejection and don’t interfere with electronic signals like some metallic tints can.
Lighting upgrades can modernize the car’s appearance and improve visibility. LED headlight bulbs provide whiter, brighter light than factory halogens, though you need to be careful about glare and make sure any upgrades are properly aimed. Aftermarket headlight housings with LED or projector technology offer the best results but are more expensive. Tinted or smoked taillights are popular for a more aggressive look, but they can reduce visibility and may not be legal in all areas.
Interior Upgrades and Comfort Enhancements
The interior is where you spend all your time in the car, so upgrades here can significantly improve your daily driving experience. Whether you’re looking for better support during spirited driving or just want a more premium feel, there are plenty of options.
Aftermarket seats are one of the most impactful interior upgrades. The factory seats are comfortable for daily driving but don’t provide much lateral support during hard cornering. Sport seats from companies like Recaro, Bride, or Sparco offer much better bolstering to keep you planted during aggressive driving. Fixed-back racing seats are the most supportive but sacrifice adjustability and can be uncomfortable for long drives. Reclining sport seats offer a better compromise for cars that see both street and track use.
A quality steering wheel can transform how the car feels. Smaller diameter wheels (320-350mm versus the factory 365mm) provide quicker steering response and a more connected feel. Alcantara or leather-wrapped wheels offer better grip than the factory material. Some enthusiasts go with quick-release steering wheels for easy entry and exit, especially when running fixed-back seats, though this requires a hub adapter and may affect airbag functionality.
Short-throw shifters reduce the distance the shifter travels between gears, making shifts quicker and more precise. The factory shifter on the GR86 and BRZ is already pretty good, but a quality short shifter from companies like Perrin, Kartboy, or STI tightens things up even more. Weighted shift knobs can also improve shift feel by adding momentum to your shifts, making them feel more mechanical and satisfying.
Pedal upgrades like aluminum pedal covers or complete pedal assemblies improve grip and add a sportier appearance. Some drivers prefer dead pedals with more surface area for better left-foot bracing during hard cornering. Adjustable pedal spacers can help dial in the perfect pedal positioning for heel-toe downshifting.
Sound system upgrades can make a big difference if you enjoy music during your drives. The factory audio system is adequate but not exceptional. Upgrading speakers, adding an amplifier, or installing a subwoofer can dramatically improve sound quality. Just be aware that adding weight for audio equipment works against the lightweight philosophy of these cars, so there’s a balance to strike.
Gauge pods and digital displays let you monitor important parameters like oil temperature, oil pressure, air-fuel ratio, and boost pressure if you’re running forced induction. This information is valuable for tracking engine health and ensuring your modifications are working properly. Companies like Defi, AEM, and Innovate Motorsports offer gauge options ranging from traditional analog displays to modern digital screens.
Cooling System Upgrades
Keeping your engine and other components at proper operating temperatures is crucial for performance and reliability, especially if you’re adding power or doing track driving. The factory cooling system is adequate for stock power levels and normal driving, but it can be overwhelmed under more demanding conditions.
An upgraded radiator with more cooling capacity helps maintain consistent engine temperatures during hard driving. Aluminum radiators with larger cores and more efficient designs can drop coolant temperatures by 10-20 degrees compared to the factory unit. This is especially important if you’re running forced induction or if you live in a hot climate.
Oil coolers are essential for track driving and highly recommended if you’ve added significant power. Engine oil temperatures can spike quickly during hard driving, and hot oil loses its protective properties. An oil cooler with a thermostatic sandwich plate maintains oil in the optimal temperature range, typically between 180-220°F. This protects your engine and ensures consistent performance lap after lap.
Transmission and differential coolers are worth considering for track use as well. The manual transmission and rear differential can overheat during extended track sessions, leading to fluid breakdown and potential damage. Coolers for these components are less common than engine oil coolers but can be valuable for serious track enthusiasts.
High-flow thermostats open at lower temperatures than factory units, allowing coolant to flow through the radiator sooner. This can help reduce overall operating temperatures, though the effect is modest. Some tuners prefer to maintain factory thermostat temperatures for optimal engine efficiency and emissions compliance.
Drivetrain and Differential Upgrades
The drivetrain components transfer power from the engine to the wheels, and upgrading them can improve acceleration, durability, and how the car puts power down.
A limited-slip differential is one of the most effective handling upgrades you can make. The factory open differential allows the inside wheel to spin freely during cornering, which wastes power and can make the car feel loose. A limited-slip differential distributes power more evenly between the rear wheels, improving traction and making the car more predictable and faster through corners. Options include clutch-type LSDs from companies like OS Giken and Cusco, or helical-gear LSDs like the Torsen or Wavetrac.
Clutch upgrades are necessary if you’ve added significant power or if you’re hard on the factory clutch. The stock clutch can handle mild power increases, but forced induction or aggressive driving will overwhelm it. Aftermarket clutches from companies like Competition Clutch, Exedy, or ACT offer higher clamping force and more durable friction materials. The trade-off is often a heavier pedal and more abrupt engagement, so choose a clutch appropriate for your power level and driving style.
Lightweight flywheels reduce rotational mass in the drivetrain, allowing the engine to rev more freely. This makes the car feel more responsive and improves acceleration, though it can also make the car slightly harder to drive smoothly in traffic due to faster engine speed changes. Single-mass flywheels are lighter than the factory dual-mass design but can introduce more vibration and noise.
Upgraded axles and driveshafts are typically only necessary if you’re making serious power or if you’re experiencing failures with the factory components. Carbon fiber driveshafts are lighter and can handle more power, but they’re expensive and usually overkill for street cars.
Weight Reduction Strategies
The GR86 and BRZ are already relatively lightweight, but removing unnecessary weight improves every aspect of performance—acceleration, braking, handling, and fuel economy. The key is to remove weight strategically without sacrificing safety or making the car impractical for your intended use.
Lightweight wheels are one of the best weight reduction modifications because they reduce both overall weight and unsprung/rotating mass. Saving 15-20 pounds in wheels makes the car feel noticeably more responsive. Lightweight batteries are another easy win—lithium-ion batteries can save 20-30 pounds compared to the factory lead-acid battery, though they’re more expensive and may require special charging equipment.
Removing the rear seats, spare tire, and jack can save 50-60 pounds if you don’t need them. This is more practical for dedicated track cars than daily drivers, but it’s worth considering if you rarely carry passengers. Sound deadening removal is popular among track enthusiasts—the factory sound deadening material adds significant weight, and removing it can save 30-40 pounds. The trade-off is increased road noise and a less refined driving experience.
Carbon fiber body panels like hoods, trunks, and fenders can save weight, but they’re expensive and the weight savings are often modest unless you’re going with full race-spec components. For most street cars, the cost-to-benefit ratio doesn’t make sense. Focus on easier, cheaper weight reduction first.
One often-overlooked aspect of weight reduction is simply removing junk from your car. Tools, old parts, and accumulated clutter can easily add 20-30 pounds. Keep your car clean and only carry what you actually need.
Track-Focused Modifications
If you’re planning to take your GR86 or BRZ to the track regularly, there are specific modifications that become priorities. Track driving is much more demanding than street driving, and components that work fine on the street can fail quickly under track conditions.
Safety equipment should be your first priority. A proper roll bar or roll cage protects you in the event of a rollover. Most track organizations require roll protection for convertibles, and some require it for all cars depending on speed and class. A quality four-point or five-point harness keeps you securely in place during hard cornering and in the event of an accident. Make sure any harness installation includes proper mounting points and a harness bar if needed.
A fire extinguisher mounted within easy reach is essential safety equipment. Track organizations typically require one, and it could save your car or your life in an emergency. Racing seats with proper FIA certification provide better support and safety than street seats.
Brake cooling ducts direct air to the brake rotors and calipers, dramatically improving brake performance and reducing fade during track sessions. These can be as simple as flexible ducting from the front bumper or as complex as custom fabricated solutions. The difference in brake performance is significant, especially during longer sessions.
Track-specific tire choices make a huge difference. R-compound tires like the Bridgestone Potenza RE-71RS or Yokohama A052 provide grip levels far beyond street tires, but they wear quickly and aren’t suitable for daily driving. Many track enthusiasts run separate wheel and tire sets—street tires for driving to and from the track, and R-compounds for track sessions.
Data acquisition systems help you improve your driving and understand what your car is doing. Systems from AiM, RaceCapture, or even smartphone apps like Harry’s Lap Timer can record lap times, speed, G-forces, and other data. Reviewing this data helps you identify areas where you can improve and track the effectiveness of modifications.
Maintenance Considerations for Modified Cars
Once you start modifying your GR86 or BRZ, your maintenance requirements and schedule may change. Modified cars often need more frequent attention, and using quality fluids and parts becomes even more important.
Oil change intervals should be shorter if you’re driving hard or tracking the car. While the factory recommends oil changes every 6,000-10,000 miles, many enthusiasts change oil every 3,000-5,000 miles, especially with forced induction or track use. Using high-quality synthetic oil designed for high-performance applications is essential. Popular choices include Motul 300V, Redline, and Mobil 1.
Brake fluid should be changed annually if you’re doing track days, as it absorbs moisture over time and loses effectiveness. Transmission and differential fluid changes become more important with hard driving as well. Many enthusiasts switch to synthetic gear oils for better protection and smoother shifting.
Keep detailed records of all modifications and maintenance. This helps with troubleshooting if problems arise, and it can increase resale value by showing potential buyers that the car has been properly maintained. Take photos during installation of major components—this can be invaluable if you need to diagnose issues later.
Build relationships with shops and tuners who specialize in the GR86 and BRZ platform. These cars have specific quirks and requirements, and working with people who know them well can save you time, money, and headaches. Online communities and forums are also valuable resources for troubleshooting and learning from others’ experiences.
Budget Planning and Modification Priorities
It’s easy to get carried away with modifications and spend more than you intended. Having a plan and prioritizing upgrades based on your goals helps you get the most value from your modification budget.
For street-focused builds, start with tires, brake pads and fluid, and a quality set of coilovers or springs. These modifications improve the driving experience dramatically without requiring major mechanical work. Add an exhaust for sound and a tune to optimize everything, and you’ll have a significantly improved car for around $3,000-$5,000.
For track-focused builds, prioritize safety equipment, cooling upgrades, brake improvements, and tires. These ensure you can drive hard safely and consistently. Suspension and aero come next, followed by power modifications once you’ve maximized the chassis and driver skill.
If maximum power is your goal, plan for forced induction as your end game and build supporting modifications first. Start with exhaust, intake, and a tune to establish a baseline. Add cooling, fuel system upgrades, and a clutch, then install your turbo or supercharger kit. This staged approach spreads out costs and ensures you have all the supporting components in place.
Remember that labor costs can equal or exceed parts costs for complex installations. If you’re not comfortable doing the work yourself, factor professional installation into your budget. Some modifications like suspension and exhaust are relatively DIY-friendly, while others like forced induction and engine tuning really require professional expertise.
Common Mistakes to Avoid
Learning from others’ mistakes can save you money and frustration. Here are some common pitfalls to avoid when modifying your GR86 or BRZ.
Don’t cheap out on critical components. Bargain-basement coilovers, brakes, or engine parts can fail and potentially cause accidents or engine damage. It’s better to save up for quality components than to buy cheap parts that you’ll need to replace. Buying once and buying right is almost always cheaper in the long run.
Avoid the “parts bin” approach of buying random modifications without a plan. Every modification should serve a specific purpose and work together with your other upgrades. Mismatched components can actually hurt performance or create problems.
Don’t ignore supporting modifications. Adding big power without upgrading your clutch, cooling system, and brakes is asking for problems. Think of your car as a system where everything needs to work together.
Be realistic about your skill level for installation. Some modifications require specialized tools and knowledge. Attempting complex work without proper experience can result in damaged parts, poor performance, or safety issues. Know when to call in a professional.
Don’t modify your car beyond your driving ability. A car with race-spec suspension and R-compound tires requires skill to drive quickly and safely. Focus on driver development alongside vehicle development—track day instruction and performance driving schools are some of the best investments you can make.
Legal and Warranty Considerations
Before modifying your car, understand the potential legal and warranty implications. Some modifications can void your warranty, and others may not be street legal in your area.
The Magnuson-Moss Warranty Act protects consumers from blanket warranty denials due to aftermarket parts. However, if a modification directly causes a failure, the manufacturer can deny warranty coverage for that specific issue. For example, if you install a turbo kit and blow your engine, that won’t be covered. But if your power windows fail, the turbo kit shouldn’t affect that warranty claim.
Keep all your factory parts. If you need warranty service, you can return the car to stock temporarily. Document everything and keep receipts for all parts and labor. Some dealers are modification-friendly, while others are not—it’s worth having a conversation with your service department about their policies.
Emissions regulations vary by state and country. In California and states that follow CARB regulations, many modifications are illegal unless they have a CARB Executive Order number. This includes most exhaust modifications that remove or replace catalytic converters, intake systems, and engine tuning. Violating emissions laws can result in fines and failed inspections. Check your local regulations before modifying emissions-related components.
Noise ordinances are another consideration. Some areas have strict limits on exhaust noise, and an aftermarket exhaust could result in tickets or failed inspections. If you live in an area with noise regulations, choose your exhaust carefully or be prepared to swap back to stock for inspections.
Insurance implications should also be considered. Some modifications, especially those that significantly increase power, should be disclosed to your insurance company. Failing to disclose modifications could result in denied claims. Some insurers offer agreed-value policies for modified cars that protect your investment in upgrades.
Building a Balanced Setup
The most satisfying modified cars are those where all the components work together harmoniously. A balanced approach considers how each modification affects the overall driving experience and ensures that no single area is neglected.
Think of your car as having three main areas: power, handling, and braking. Ideally, these should be developed together. Adding 100 horsepower without improving brakes and suspension creates an unbalanced car that’s fast in a straight line but scary in corners. Similarly, a car with race suspension and brakes but stock power might handle beautifully but feel slow.
The GR86 and BRZ are already well-balanced from the factory, which is part of their appeal. When modifying, try to maintain that balance. If you add power, add grip and braking to match. If you stiffen the suspension, make sure your tires can take advantage of it.
Consider the driving experience as a whole. A car that’s miserable to drive on the street because it’s too loud, too stiff, or too temperamental won’t get driven and won’t be enjoyed. Unless you’re building a dedicated track car, maintain some level of street manners. The best modified cars are those that are improved in the areas that matter to you while remaining practical for your intended use.
Test and tune as you go. After each modification, spend time driving the car and understanding how it’s changed. This helps you make informed decisions about future upgrades and ensures you’re moving in the right direction. Don’t be afraid to adjust or even reverse modifications that don’t work out as expected.
Resources and Community
The GR86 and BRZ community is active and helpful, with extensive resources available for owners looking to modify their cars. Online forums like FT86Club and GR86.org are treasure troves of information, with detailed build threads, troubleshooting advice, and vendor reviews. These communities have collectively tested thousands of parts and combinations, so you can learn from their experiences.
Social media groups on Facebook, Reddit, and Instagram connect you with other owners and provide inspiration for your build. YouTube channels dedicated to the platform offer installation guides, product reviews, and build documentation that can be invaluable when planning modifications.
Local car clubs and meetups let you see modifications in person and talk to owners about their experiences. There’s no substitute for seeing and hearing parts in real life, and the community is generally welcoming to newcomers with questions.
Track day organizations like NASA, SCCA, and local clubs offer opportunities to drive your car in a safe, controlled environment where you can explore its limits. Many offer instruction for beginners, which is one of the best ways to improve your driving and understand what modifications will actually benefit you.
Reputable vendors who specialize in the platform include companies like FT Speed, 86 Speed, and CounterSpace Garage. These shops understand the cars thoroughly and can provide expert advice on parts selection and installation. Building a relationship with a good shop can make your modification journey much smoother.
Final Thoughts on Modifying Your GR86 or BRZ
The 2024 Toyota GR86 and Subaru BRZ are exceptional platforms for modification. They respond well to upgrades, have extensive aftermarket support, and maintain their character even with significant changes. Whether you’re looking for more power, sharper handling, or just want to personalize your car, there are proven modifications that deliver real results.
Start with a clear vision of what you want from your car. Are you building a weekend track weapon, a stylish daily driver, or something in between? Let that vision guide your modification choices and help you prioritize where to spend your money. Focus on quality over quantity—a few well-chosen, properly installed modifications will always beat a pile of cheap parts.
Remember that the best modification is often driver development. Track instruction, autocross experience, and seat time will make you faster and help you appreciate what your car can already do. As you develop your skills, you’ll better understand what modifications will actually benefit your driving.
Take your time and enjoy the process. Building and modifying a car is a journey, not a destination. Each upgrade teaches you something about your car and what you value in the driving experience. Don’t rush to copy someone else’s build—create something that reflects your own priorities and style.
Most importantly, drive your car. Modifications are meaningless if the car sits in the garage. Get out there, enjoy the roads, attend events, and connect with the community. The GR86 and BRZ are meant to be driven and enjoyed, and the right modifications can make that experience even more rewarding.