Understanding Exhaust System Basics

Before diving into the specifics of each brand, it's important to understand what an exhaust system does. The factory exhaust on your GR86 is designed to meet noise regulations, emissions standards, and cost constraints — not maximum performance. By replacing it with an aftermarket system, you reduce restriction, lower back pressure, and allow the engine to breathe more freely. This translates into measurable gains in horsepower, torque, and throttle response. Additionally, a performance exhaust can dramatically improve the sound of the FA24 engine, giving it a more aggressive and sporty note. The key factors to consider when choosing an exhaust include material, pipe diameter, muffler design, and overall weight.

Eventuri Exhaust System – Engineering Excellence

Eventuri is a British engineering firm renowned for its high-end carbon fiber intake and exhaust systems. Their offering for the GR86 is no exception — it combines meticulous design with premium materials to deliver both performance and aesthetics.

Design and Materials

The Eventuri exhaust is constructed from high-grade carbon fiber for the tailpipe tips and a combination of T304 stainless steel for the main piping. The carbon fiber components are not just cosmetic; they reduce overall weight by several pounds compared to all-steel systems. The system features a free-flowing straight-through muffler design that minimizes turbulence while retaining a deep, refined tone. Eventuri’s engineers also focused on resonance tuning to eliminate annoying drone during highway cruising.

Performance Gains and Dyno Results

On a stock GR86, Eventuri claims gains of 10–15 horsepower and 8–12 lb-ft of torque at the wheels. Third-party dyno tests have confirmed these numbers, with many users reporting a peak improvement of around 12 HP. The torque curve is notably flatter, especially in the mid-range (3,500–5,500 RPM), which makes the car feel more responsive in everyday driving. For those looking to combine the exhaust with a tune, the gains can be even more substantial.

Sound Profile

The Eventuri exhaust produces a deep, bass-heavy tone that is aggressive under hard acceleration but civilized at idle and cruise. It is not overly loud; the sound stays refined without crossing into obnoxious territory. This makes it a good choice for owners who want a sporty note without attracting unwanted attention. The exhaust also develops a characteristic crackle on deceleration, adding to the driving experience.

Perrin Exhaust System – Proven Performance

Perrin Performance is a well-established name in the Subaru and Toyota aftermarket scene. Their exhaust for the GR86 focuses on durability, easy installation, and customizable sound. With decades of experience tuning boxer engines, Perrin’s design is tailored to the FA24’s characteristics.

Construction and Durability

The Perrin system uses mandrel-bent T304 stainless steel throughout, ensuring smooth flow and excellent corrosion resistance. The piping is 3 inches in diameter, matching the factory flange for a direct bolt-on fit. The system includes a removable baffle that allows users to adjust the volume — a feature that sets it apart from many competitors. Perrin also uses high-quality hangers and clamps, reducing vibration and preventing rattling over time.

Performance Gains and Real-World Testing

Perrin reports 8–12 horsepower and 6–10 lb-ft of torque gains on a stock GR86. Independent dyno runs have shown consistent mid-range improvements, with the exhaust adding about 10 HP at the wheels. The torque curve benefits most between 3,800 and 6,000 RPM, making the car feel punchy during overtaking maneuvers. With the optional baffle removed, power gains tend to be at the higher end of the range.

Sound Customization

The Perrin exhaust is known for its aggressive, raspy tone — especially with the baffle removed. It offers a louder, more track-oriented sound that enthusiasts often prefer for spirited driving. The baffle can be inserted for a slightly quieter exhaust note, but even then it remains louder than stock. This makes it a great choice for drivers who want to be heard, but also appreciate the option to tone things down for daily commutes.

Side-by-Side Comparison: Eventuri vs Perrin

Both systems are excellent, but they cater to different priorities. The table below summarizes the key differences.

Feature Eventuri Perrin
Material Carbon fiber tips + stainless steel Full T304 stainless steel
Weight ~18 lbs (lighter) ~24 lbs
Horsepower gains (wheel) 10–15 HP 8–12 HP
Torque gains 8–12 lb-ft 6–10 lb-ft
Sound character Deep, refined, low drone Aggressive, raspy, adjustable
Installation Straightforward, bolt-on Very easy, includes hardware
Price ~$1,200–$1,400 ~$800–$1,000
Warranty Limited lifetime Limited lifetime

Material and Weight

Eventuri’s use of carbon fiber for the tips and some internal components saves approximately 6 pounds compared to the Perrin system. While this may not drastically affect lap times, it does contribute to a lighter overall feel and reduces unsprung mass. Perrin’s all-steel construction is more traditional and extremely robust, making it better suited for harsh climates or track use where rock chips and road debris could damage carbon fiber.

Horsepower and Torque

Eventuri’s optimized flow design gives it a slight edge in peak horsepower, but both systems produce similar gains in real-world driving. The larger mid-range torque improvement from Eventuri may be more noticeable during daily driving, while Perrin’s gains are concentrated in the higher RPM range, complementing a track-oriented style.

Sound and Aesthetics

Sound is subjective, but there are clear differences. Eventuri’s exhaust is refined and deep, with a European sports car character. Perrin’s is raw and aggressive, reminiscent of classic Subaru boxer exhausts. Visually, Eventuri’s carbon fiber tips add a premium touch, while Perrin offers a choice between polished stainless steel or black ceramic-coated tips.

Price and Value

Perrin is significantly more affordable — typically $400–$500 cheaper than Eventuri. For the price, you get a durable, proven system that delivers strong performance and adjustability. Eventuri commands a premium for its carbon fiber components and refined engineering, making it a statement piece for those who value aesthetics and exclusivity as much as performance.

Installation and Fitment

Both systems are designed for easy DIY installation. Perrin includes detailed instructions and a complete hardware kit, making it one of the simplest exhausts to install. Eventuri also provides a quality kit, but the carbon fiber tips require careful alignment to avoid rubbing against the bumper cutouts. Overall, both can be installed in under two hours with basic hand tools.

Which Exhaust Is Right for Your GR86?

For the Track Enthusiast

If you plan to track your GR86 regularly, the Perrin exhaust may be the better choice. Its aggressive sound provides clear audio feedback during cornering, and the adjustable baffle lets you comply with noise restrictions at some circuits. The all-steel construction is more resistant to damage from heat and debris. Additionally, the lower price leaves budget for other track-focused modifications like suspension or tires.

For the Daily Driver

For a car that sees double duty as a commuter, the Eventuri exhaust is likely more livable. Its deep, refined tone minimizes drone and is less fatiguing on long drives. The weight savings are a bonus for fuel economy, and the premium carbon fiber tips add a touch of luxury that complements the GR86’s sporty interior. If you often drive early in the morning or through quiet neighborhoods, the Eventuri will draw less attention.

For the Sound Purist

If sound is your primary concern, consider your preferred character. The Eventuri offers a symphonic, European-inspired note that builds smoothly with RPM. The Perrin delivers a guttural, rally-inspired bark that is unmistakable. Listening to sound clips online can help you decide; but if possible, hear both in person — the recordings often flatten the dynamic range.

Final Verdict

Both Eventuri and Perrin deliver impressive performance gains and sound improvements for the Toyota GR86. The Eventuri exhaust is the premium choice — lighter, slightly more powerful, and more refined in sound. It justifies its higher price with carbon fiber craftsmanship and a uniquely cultured exhaust note. For owners who want the best possible overall package and are willing to invest, Eventuri is a top-tier option.

The Perrin exhaust offers exceptional value and proven reliability. Its adjustable sound, robust construction, and lower cost make it a practical choice for enthusiasts who prioritize function over form. For track use or budget-conscious builds, Perrin is hard to beat.

Ultimately, the right exhaust depends on your priorities. If you value light weight and refined sound, go with Eventuri. If you want customizable aggression and durability, choose Perrin. Either way, you’ll unlock the true potential of the GR86’s engine and transform your driving experience.

For more information, visit the official product pages: Eventuri GR86 Exhaust and Perrin GR86 Exhaust. Additional dyno charts and owner reviews can be found on GR86.org.