The Lexus IS has long been a benchmark for compact luxury sedans, blending daily comfort with a sporty character. For 2024, the lineup continues the tradition with the IS 300, IS 350, and the potent IS 500 F Sport Performance, each offering a different starting point for enthusiasts. While the factory setup is well-refined, the aftermarket has developed a mature ecosystem of parts that can transform the IS into a sharper, faster, and more engaging machine. This guide covers the most effective performance modifications for the 2024 Lexus IS, focusing on genuine gains in power, handling, and cost efficiency without sacrificing the car’s core livability.

Understanding the Lexus IS Platform for 2024

Before diving into parts, it helps to know what you’re working with. The current generation (XE30) has been updated with sharper styling and improved chassis rigidity. Engine choices are carryovers: the 2.0L turbo four in the IS 300 (241 hp), the 3.5L V6 in the IS 350 (311 hp), and the naturally aspirated 5.0L V8 in the IS 500 (472 hp). The 2024 models retain the same drivetrain architecture, meaning most parts from the 2014–2023 years fit. The 8-speed automatic (or 6-speed in base IS 300) is robust but benefits from tuning. AWD versions are available, but many handling mods are RWD-focused. Choose your platform wisely, as the IS 500 already possesses strong factory performance and requires fewer immediate upgrades.

Power Modifications

Intake Systems

Replacing the restrictive factory airbox with a high-flow cold air intake is one of the first upgrades many owners perform. The benefits are modest without tuning, but a properly designed intake reduces intake air temperatures and improves throttle response. For the 3.5L V6 in the IS 350, systems from RR Racing and Mishimoto are proven to flow well and fit inside the stock engine bay. The IS 500 V8 also responds to intakes that remove the resonator and use a heat shield, such as the Injen Evolution or AFE Power units. Expect gains of 5–10 hp at the wheels with a quality intake and fresh filter; the real benefit is the intake sound and slightly quicker spool on the turbo IS 300.

Performance Exhaust Systems

An upgraded exhaust does more than change the soundtrack. Reducing backpressure allows the engine to breathe out more freely, especially when combined with other modifications. A cat-back system is the most straightforward. For the V6 and V8, dual exhaust setups from A’PEXi, HKS, or Borla provide a deeper tone and are typically at least 10–15 pounds lighter than the factory stack. Headers are a larger commitment on the V6: replacing the factory manifolds with long-tube headers (like those from PPE Engineering or OBX) can free up 15–25 whp but require a tune to avoid CELs. The IS 300 turbo responds well to a downpipe upgrade, which spools the turbo faster and can add 20–30 whp with a tune. Always check local noise regulations before installing an aggressive exhaust.

ECU Tuning

The engine control unit is the brain of the car, and unlocking its potential through reflashing is the single best performance upgrade for almost any Lexus IS. Companies like ECUTek and D3 Performance offer tuning solutions for both the V6 and the turbo four. For the IS 350, a tune can raise the redline to 7200 rpm, sharpen throttle response, and increase peak power by 20–30 hp on pump gas. The turbo IS 300 gains even more: with a downpipe and intake, a tune can yield 280–300 whp. Tuning also allows you to disable the rear exhaust valve on the IS 500 and adjust the transmission shift points. Expect to pay $400–$1,200 for a custom tune or off-the-shelf file. This is the best horsepower per dollar available.

Forced Induction (IS 350 and IS 500)

For those chasing serious power, supercharger kits exist for the 3.5L V6. RR Racing offers a complete supercharger system that produces 450–500 hp at the crank on a stock engine. Installation is involved, and the cost is steep (north of $6,000), but the torque delivery is linear and reliable when using a proper intercooler and fuel system upgrades. The IS 500’s 5.0L V8 is less commonly boosted, but centrifugal supercharger kits from companies like Vortech or ProCharger have been developed. These require extensive supporting mods (fuel pump, injectors, cooling) and are best left to experienced shops. For most owners, a tune and bolt-ons provide enough excitement without the expense and complexity of forced induction. Turbocharging the V6 is possible but rare due to lack of production kits.

Drivetrain Upgrades

Beyond the engine, there are minor drivetrain mods that help deliver power to the ground. A lightweight crank pulley reduces rotational mass and helps the engine rev faster—gains are small but noticeable. On the IS 350, installing a ported intake manifold (like the one from RR Racing) can improve top-end airflow when combined with a tune. Upgrading to a less restrictive throttle body (e.g., 80mm) also helps once the intake and exhaust are flowing well. For the automatic transmission, a transmission cooler is recommended if you plan on heavy track use. Differential bushings and a limited-slip differential (if your car didn’t come with one) will eliminate wheel hop and improve traction during hard launches.

Handling Modifications

Suspension Systems

The IS platform is already well-balanced, but factory suspension tuning prioritizes comfort over ultimate cornering grip. Coilover kits from KW, Ohlins, or BC Racing allow you to lower the center of gravity and adjust damping to suit your driving style. The KW V3 offers both compression and rebound adjustability, while the Ohlins Road & Track provides excellent valve tuning for street and occasional track use. For a budget entry, BC Racing BR series coilovers are a solid choice. If you want to retain the factory adaptive dampers on some models, aftermarket springs from Swift or Eibach can lower the car by about an inch and reduce body roll without sacrificing ride quality completely. Pairing springs with upgraded bump stops is essential. A proper corner balance and alignment after installation will maximize the chassis potential.

Sway Bars and Chassis Bracing

One of the cheapest handling improvements is stiffer anti-roll bars. The factory bars are soft, allowing noticeable body roll during aggressive cornering. A set of adjustable front and rear sway bars from Hotchkis, Eibach, or RR Racing can dramatically reduce roll and improve turn-in response. The rear bar is especially effective on the IS 350/500 for reducing understeer. Additionally, chassis braces (front strut tower brace, lower brace) stiffen the chassis to reduce flex. This is most noticeable on cars that see track use or heavy cornering loads. These braces are inexpensive and easy to install. For maximum chassis stiffness, consider the Cusco or Carbing full bracing kits.

Wheels and Tires

Tires are the most critical component for grip. The factory tires may be all-seasons that prioritize fuel economy and wear. Upgrading to a set of ultra-high-performance summer tires like the Michelin Pilot Sport 4S or Continental ExtremeContact Sport transforms both grip and braking feel. The IS can fit 255/35R19 or 265/35R19 tires with appropriate offsets on 8.5–9.5 inch wide wheels. Lightweight forged wheels (e.g., Enkei, Rays, or BBS) reduce unsprung mass, improving suspension response and acceleration. For track days, semi-slick tires like the Bridgestone RE-71RS or Hankook RS-4 are excellent choices. A square tire setup (same width front and rear) can reduce understeer and allow tire rotation for extended life.

Brake Upgrades

Stopping power often becomes a priority after adding power. The IS 350 and IS 500 come with decent brakes, but fade during repeated hard stops is a common complaint. A big brake kit (BBK) from StopTech, Brembo, or Project MU provides larger rotors and multi-piston calipers, reducing fade and improving pedal feel. A less expensive option is upgrading pads to a high-performance street pad (like Hawk HPS or EBC Yellowstuff), adding stainless steel brake lines, and using high-temperature brake fluid (Motul RBF600). Slotted rotors also help dissipate gas and maintain performance. This combination works well for spirited street driving and occasional lapping days. For the IS 500, front brake ducts can lower temperatures even further.

Cost-Effective Modifications

Simple Bolt-Ons with Big Returns

Not every upgrade requires a large budget. A drop-in high-flow air filter (e.g., K&N or aFe) is a $50 upgrade that can be cleaned and reused. A proper wheel alignment with a performance-oriented alignment spec (more camber up front, slight toe-in at the rear) costs about $100 and can sharpen turn-in grip. Removing the spare tire and some interior trim reduces weight by 50 pounds for free. Also, replacing the OEM spark plugs with iridium plugs at the recommended interval ensures consistent combustion. Sometimes, the cheapest modifications are the ones that come from proper maintenance: fresh synthetic oil, clean filters, and correct tire pressures all contribute to optimal performance.

Weight Reduction Strategies

Weight is the enemy of performance, and the Lexus IS is not a light car (3,600–3,900 lbs). Simple weight reduction can improve acceleration, braking, and cornering. Replacing the heavy factory seats with lightweight bucket seats (e.g., Recaro Pole Position or Bride) can save 30–40 pounds per seat. The stock battery is heavy; a lightweight lithium-ion battery from Antigravity or Braille shaves 20–30 pounds. Even the factory exhaust is heavy: a cat-back system saves 10–20 pounds. For a daily driver, you don’t have to go to extremes, but every pound reduction counts. Avoid removing sound deadening unless it’s a dedicated track car.

Performance Software and Electronic Accessories

Some inexpensive aftermarket modules can improve throttle response without a full tune. Devices like the Pedal Commander or Sprint Booster adjust the pedal mapping, making the car feel snappier. While they don’t add horsepower, they eliminate the factory throttle lag. Similarly, aftermarket shift knob upgrades (e.g., BilletWorkz or Raceseng) improve shift feel in manual transmission cars, but note that most IS models sold in 2024 are automatic (the IS 500 is auto-only). For automatic cars, paddle shifter extensions can make manual mode more engaging. Performance alignment tools like a digital angle gauge help DIY owners set camber accurately.

Building a Balanced Performance Package

Rather than pursuing power first, consider a staged approach that keeps the car cohesive. Stage 1: ECUTune, intake, and cat-back exhaust – this adds approximately 30–40 hp on the IS 350 and transforms drivability. Stage 2: Add sway bars, performance tires, and a quality alignment – this improves cornering speed without upsetting ride quality. Stage 3: Coilovers, big brake kit, and lightweight wheels – this is for serious track use. Stage 4: Forced induction or headers with full exhaust and cooling upgrades – this requires a larger budget and supportive maintenance. Always prioritize tires, brakes, and suspension before adding significant power. The IS 500 owners may only need a tune and sway bars to reach a very high performance level that outpaces many sports cars.

Conclusion

The 2024 Lexus IS is a fantastic canvas for personalization. Whether you drive the turbo four, the iconic V6, or the naturally aspirated V8, there are modifications that suit every priority and budget. By focusing on proven intake and exhaust upgrades, a proper tune, and a targeted handling package, you can sharpen the IS into a genuine driver’s car without compromising its everyday usability. The aftermarket support continues to grow, and with careful selection, your IS can deliver an experience that rivals dedicated performance coupes. Start with a plan, research thoroughly, and enjoy the process of making your Lexus truly yours.