Introduction

The Scion FR-S, along with its siblings the Subaru BRZ and Toyota GT86, has long been celebrated as a purist’s sports car. Its low curb weight, near-perfect 50:50 weight distribution, and responsive naturally aspirated boxer engine deliver an engaging driving experience straight from the factory. However, even the best platforms leave room for personalization. With the aftermarket constantly evolving, 2024 brings a fresh wave of components that can unlock hidden potential. Whether you are chasing track-day lap times or simply want a more thrilling daily commute, focusing on the right upgrades matters more than throwing parts at the car. This guide examines the five most impactful performance upgrades for the Scion FR-S in 2024, covering power, handling, and braking. Each section explains the benefits, installation considerations, and product recommendations so you can make informed decisions.

1. Cold Air Intake System

A cold air intake is often the first modification enthusiasts install. The stock airbox is designed for quiet operation and cost efficiency, not maximum airflow. By replacing the restrictive factory intake with a properly designed cold air unit, you allow the engine to draw in cooler, denser air. This simple change can yield modest horsepower gains (typically 5–10 hp) while sharpening throttle response. More importantly, it amplifies the intake note, giving the FA20 engine a more aggressive growl under acceleration.

Benefits Beyond Horsepower

While the power increase is welcome, the real-world improvement lies in the removal of intake restriction. A cold air intake reduces the work the engine has to do to pull in air, which can improve fuel efficiency during normal driving. Additionally, many kits include a reusable high-flow filter, saving money on replacements over time. The enhanced sound also makes the driving experience more engaging without being obtrusive at cruising speeds.

Installation and Considerations

Most cold air intakes for the FR-S are designed for a straightforward bolt-on installation using basic hand tools. The process typically takes one to two hours. However, be aware that some kits relocate the filter into the front bumper area, which may require trimming plastic shrouds. If you live in an area with frequent rain or deep puddles, consider a hydro shield or a short-ram intake that stays in the engine bay to avoid water ingestion. Reputable brands for the FR-S include Perrin, K&N, and Injen.

2024 Recommendation

The Perrin Cold Air Intake remains a top choice for 2024 due to its proven power gains, excellent filtration, and included heat shield that minimizes intake air temperatures. Pair it with a tune for maximum benefit, though the intake alone will still provide noticeable improvements.

2. High-Performance Exhaust System

After the intake, a free-flowing exhaust is the next logical step. The FR-S leaves the factory with a restrictive exhaust that quietens the flat-four engine’s character. A cat-back or axle-back exhaust system reduces back pressure, allowing exhaust gases to exit more efficiently. This can add 5–15 hp depending on the design and whether you replace the entire system from the headers back. More importantly, it transforms the soundtrack into a higher-pitched, Subaru signature rumble.

Types of Exhaust Upgrades

Cat-back systems replace everything from the catalytic converter rearward. They offer the best balance of sound improvement and power gain for daily drivers. Axle-back systems replace only the mufflers and tips, providing a cost-effective way to change the sound without major power gains. For the serious enthusiast, a full header-back system (including aftermarket headers) can unlock 20+ hp, but it requires a tune and may affect emissions compliance.

Sound Characteristics

Exhaust tone is subjective. Some drivers want a deep, aggressive note, while others prefer something more refined. Stainless steel systems generally offer a raspier high-end tone, while aluminized steel tends to produce a deeper sound. Titanium systems are lightweight and offer a unique pitch. Popular 2024 options include the Borla Type S Cat-Back for a moderate yet sporty note, and the Greddy Supreme SP for a quieter but still aggressive profile.

Installation Tips

Installing a cat-back exhaust is a driveway-friendly job. You will need jack stands, penetrating oil for rusted bolts, and a torque wrench. The stock muffler assembly is heavy, so have a helper. After installation, check for leaks at all gaskets and ensure the tips are centered. A torque spec of 35–40 lb-ft is typical for flange bolts. Some aftermarket hangers may be needed to eliminate rattling.

3. ECU Tune

An ECU tune is arguably the single best performance upgrade for the FA20 engine. The factory ECU is calibrated for emissions, fuel economy, and reliability, leaving significant untapped potential. By remapping the fuel and ignition tables, a professional tune can unleash 15–30 hp on an otherwise stock car. Throttle response sharpens, and the infamous torque dip (a flat spot around 3500–4500 rpm) can be nearly eliminated.

Options for Tuning

There are two primary routes: off-the-shelf (OTS) tunes from companies like Open Flash Performance or custom dyno tuning. OTS tunes are convenient and affordable (often using an Ecutek or OpenFlash tablet), but they are generic. Custom tuning by a respected shop can extract every bit of power from your specific car and modifications. For 2024, the OpenFlash Tablet remains a popular choice because it also functions as a data logger and code reader.

What to Expect After a Tune

Besides the horsepower gain, you will notice a smoother power delivery and a much more responsive gas pedal. Some tunes also include features like launch control, flat-foot shifting, and rev-hang reduction. Fuel efficiency can improve under normal driving because the engine no longer runs overly rich in certain regions. However, it is essential to use high-octane fuel (91 or 93) to avoid knock. Always monitor your engine’s knock correction values after flashing.

Important Caveats

An ECU tune modifies the factory safety margins. While modern tunes are safe, improper tuning can lead to engine damage. Only use files from reputable tuners or get a custom dyno tune. Also, be aware that reflashing the ECU may affect warranty on a new car, but for a 2013+ FR-S, most are out of powertrain warranty anyway. Tuning complements other bolt-on mods; for maximum results, tune after installing intake and exhaust.

4. Performance Suspension Kit

The FR-S already handles well from the factory, but its suspension is optimized for comfort and cost. A performance suspension kit — whether coilovers, lowering springs, or a full strut setup — can dramatically improve cornering stability and reduce body roll. Lowering the center of gravity also helps with traction and aesthetics. For 2024, the trend is toward adjustable coilovers that allow fine-tuning of damping and ride height for specific driving needs.

Coilovers vs. Lowering Springs

Coilovers replace the entire strut assembly with height-adjustable units. They offer the best performance because damping can be tuned independently. Entry-level options like BC Racing BR Series provide excellent value, while high-end sets from Öhlins or KW are used by serious track enthusiasts. Lowering springs are cheaper and easier to install, but they use the factory dampers, which may not be ideal for the lower ride height. The ride quality often becomes bouncier.

Alignment and Setup

A suspension upgrade is only as good as its alignment. After installing coilovers, get a proper corner balance and alignment. Typical FR-S track specs include 2–3° of negative camber up front and 1.5–2.5° in the rear, with minimal toe. This setup maximizes tire contact in corners. Street-driven cars should keep camber more moderate to preserve tire life. A good alignment shop with experience on the FR-S chassis is worth the investment.

2024 Recommendations

For those on a budget, the Tein Flex Z coilovers offer 16-way damping adjustability and a comfortable ride for daily use. For track-focused drivers, the KW V3 or Ohlins Road & Track provide superior bump control and weight transfer management. Pair your suspension upgrade with aftermarket sway bars (e.g., Whiteline or Hotchkis) to reduce roll further without sacrificing ride quality.

5. Upgraded Brake System

With increased power and handling capability, you must also upgrade stopping power. The stock FR-S brakes are adequate for street driving but fade quickly under repeated hard braking on track days. A big brake kit (BBK) with larger rotors and multi-piston calipers provides consistent stopping power and reduces pedal effort. For 2024, many manufacturers offer bolt-on BBKs that fit under stock 17-inch wheels or require 18-inch wheels.

Upgrade Paths

Pads and Rotors: For light-duty upgrades, high-performance brake pads (e.g., Hawk HP+ or EBC Yellowstuff) combined with slotted rotors can improve bite and fade resistance. Big Brake Kits: A BBK from StopTech, AP Racing, or Brembo offers 4- or 6-piston calipers gripping larger 330mm+ rotors. These kits dramatically reduce stopping distances and provide consistent pedal feel.

Brake Fluid and Lines

When upgrading pads and rotors, do not overlook brake fluid. High-temperature brake fluid (DOT 4 or 5.1) with a high wet boiling point is essential. Stainless steel braided brake lines replace the rubber hoses to eliminate expansion under pressure, improving pedal feel and consistency. These are relatively inexpensive and easy to install.

Installation and Costs

A BBK installation requires mechanical skill; you may need to remove and replace caliper brackets, hoses, and rotors. Bleeding the brake system properly is critical. Expect to spend between $1,000 and $3,000 for a quality kit. If that is out of budget, start with performance pads, rotors, fluid, and lines — this combination can vastly improve braking performance for under $500.

Conclusion

The Scion FR-S remains a fantastic platform for modification because it responds well to targeted upgrades. Combining a cold air intake, high-performance exhaust, ECU tune, suspension kit, and upgraded brakes transforms the car into a truly capable sports machine. In 2024, the aftermarket offers more options than ever — from budget-friendly entry-level parts to race-ready components. The key is to prioritize based on your goals: power, handling, or stopping. Always research compatibility and consider professional installation for complex jobs. With these five upgrades, you can unlock the full potential of your FR-S and enjoy an even more engaging driving experience.

For further reading, check out FT86Club for community reviews and build threads, or visit CounterSpace Garage for expert tuning advice. Happy driving.