The Subaru BRZ has long been celebrated as a driver’s car, offering a lightweight chassis, near-perfect balance, and a responsive flat-four engine that begs for revs. Yet even the most ardent enthusiasts know that the FA20 engine—shared with the Toyota GT86 and Scion FR-S—leaves some performance on the table from the factory. One of the most effective bolt-on upgrades to unlock that potential is a quality set of equal-length headers, and few names carry as much trust in the Subaru-community as Perrin Performance. In this article we examine the material quality and performance improvements that Perrin headers deliver for the BRZ, and explore what makes them a standout choice for drivers who demand more from their car.

Understanding Perrin Headers for the BRZ

Perrin Performance has been engineering aftermarket parts for Subaru and Toyota vehicles since the early 2000s, building a reputation for careful R&D and real-world testing. Their BRZ header (often referred to as the Perrin Equal Length Header) is designed specifically to address the factory’s compromise between cost, emissions, and power. The BRZ comes from the factory with a unequal-length header manifold that produces the classic Subaru rumble—a sound many love—but sacrifices exhaust scavenging efficiency and top-end power. Perrin’s equal-length header reconfigures the exhaust pulses to flow smoothly, reducing back pressure and improving the engine’s ability to breathe.

The header is a primary component of any exhaust system upgrade because it directly influences how exhaust gases exit the combustion chamber. By improving flow, cylinders can evacuate spent gases more completely, allowing fresh air-fuel mixture to enter. This effect is known as scavenging. Perrin’s design uses precisely calculated primary tube lengths and collector merges to maximize this scavenging across a wide RPM range, rather than tuning for a single peak. The result is a broader powerband and more usable torque.

Material Quality: Built to Last

The longevity and performance of any header depends heavily on the materials and manufacturing processes used. Perrin headers for the BRZ are constructed from 304 stainless steel—an industry standard for high-performance exhaust components. 304 stainless offers excellent resistance to corrosion, even in harsh climates where road salt and moisture are common. It also withstands the extreme temperatures generated by the FA20’s exhaust, typically reaching 800–900°C under hard driving, without warping or cracking prematurely.

Beyond the alloy chosen, the tubing is mandrel-bent, meaning the bends are formed with an internal mandrel that prevents the tube from collapsing or wrinkling. This is critical for maintaining a consistent inner diameter throughout the header. Crush-bent tubes, common on budget headers, create restrictions that disrupt flow and increase turbulence. Mandrel bending ensures smooth gas flow and minimizes back pressure, which directly contributes to the horsepower gains Perrin headers are known for.

The headers feature premium TIG welding throughout. Each flange, collector, and primary tube join is welded with consistent penetration and a clean bead. Poor welds can lead to exhaust leaks, oxygen sensor misreads, and eventually cracks from vibration. Perrin’s welding quality is regularly praised by installers for its fit and finish. The flanges themselves are laser-cut from thick stainless steel and are precision-machined to seal against the cylinder head without the need for excessive gasket compression. Many aftermarket headers use thinner flanges that can warp under heat, but Perrin’s robust flanges help maintain a leak-free seal over time.

Perrin also includes high-quality gaskets and hardware in the kit. The gaskets are multi-layer steel (MLS) designed to withstand thermal expansion cycles, and the bolts are grade 8.8 or better to avoid stripping during installation. Some headers on the market require reusing factory gaskets or buying aftermarket ones separately—Perrin simplifies the process by including everything needed.

Heat Management Considerations

One often overlooked aspect of header material quality is how the header affects under-hood temperatures. Perrin headers are not ceramic-coated from the factory, but they are available as a bare stainless steel unit. Many owners choose to wrap the headers with heat wrap or have them ceramic-coated to reduce under-hood heat and improve exhaust gas velocity. Ceramic coating also adds an extra layer of corrosion resistance and can cut under-hood temperatures by up to 50°F. Perrin’s stainless steel construction accepts aftermarket coatings or wrapping well, though care must be taken not to trap moisture against the stainless, which can cause surface rust. When properly coated or wrapped, the Perrin header maintains structural integrity while keeping the engine bay cooler for the intake and other components.

Performance Improvements: Real-World Gains

Upgrading to Perrin headers yields measurable improvements in horsepower, torque, throttle response, and sound. Independent dyno tests have shown gains of 10–15 wheel horsepower and similar torque increases when paired with a quality cat-back exhaust and a proper ECU tune. On a completely stock BRZ, the headers alone may yield 8–10 whp, but the real magic happens when the headers are combined with a tune that takes advantage of the improved airflow. Many owners report a noticeable reduction in the torque dip that plagues the FA20 between 3000–4000 RPM. The equal-length design smooths out the torque curve, delivering a flatter, more linear power delivery.

Throttle response also improves because the engine no longer has to work against excessive back pressure. Drivers frequently describe the car as feeling “freer” and more willing to rev. The engine spins up quicker, and the powerband feels broader than the stock setup. This makes the car more enjoyable both on back roads and on the track.

Sound Characteristics

Equal-length headers change the exhaust note from the boxer rumble to a more aggressive, high-pitched howl reminiscent of a classic flat-four race engine. Some purists mourn the loss of the signature rumble, but the trade-off is a soundtrack that better matches the car’s performance potential. The Perrin headers produce a clean, crisp note under load and are surprisingly civilized during cruising when paired with a free-flowing cat-back exhaust. For those who want to retain some low-frequency growl, pairing with a resonated front pipe or a muffled cat-back can balance sound levels.

Scavenging and Cylinder-to-Cylinder Consistency

The key engineering advantage of Perrin’s equal-length header is optimized exhaust scavenging. By making each exhaust primary tube the same length, the pressure waves from each cylinder arrive at the collector at evenly spaced intervals. This creates a vacuum effect that helps pull exhaust out of adjacent cylinders, reducing pumping losses. The result is improved volumetric efficiency and a measurable increase in power. The factory unequal-length header sacrifices this uniformity for a sound signature, so Perrin’s redesign is a performance-focused solution that aligns with the BRZ’s sporting character.

Installation Considerations and Tuning

Installing Perrin headers on a BRZ is a job that many experienced DIYers can tackle, but it does require patience, the right tools, and attention to detail. The process typically involves removing the factory header assembly (which includes the catalytic converter), unbolting the oxygen sensors, and dropping the exhaust system. Access can be tight, and some owners find it easier to work on a lift or with the car on jack stands.

Perrin headers are designed as a direct bolt-on replacement, meaning no modification to the chassis or exhaust system is required in most cases. However, after installation, a check engine light (CEL) is common because the aftermarket header often relocates or deletes the secondary oxygen sensor bung. Perrin headers include a bung for the rear O2 sensor, but the sensor will still detect a different flow rate and catalyst efficiency than the ECU expects. The robust solution is to reflash the ECU with a tune that disables the catalyst monitoring. Tuning also allows the engine to take full advantage of the improved exhaust flow—without it, the gains are moderate and the car may run lean in some conditions.

Required Tools and Skill Level

  • Tools: Ratchet, extension bars, 12mm, 14mm, 17mm sockets, O2 sensor socket, penetrating oil, torque wrench, and exhaust hanger removal tool or pry bar.
  • Skill: Intermediate to advanced. Experience with exhaust work and handling oxygen sensors is helpful. Professional installation is recommended if you are uncertain about your ability to ensure a leak-free seal.
  • Time: 3–6 hours depending on rust condition and prior modifications.

Compatibility With Other Mods

Perrin headers work well with aftermarket cat-back exhaust systems, but gains are maximized when the entire exhaust path is upgraded. A high-flow front pipe and cat-back exhaust will further reduce restriction. For those seeking the ultimate naturally aspirated BRZ, pairing Perrin headers with a cold air intake, a tune, and a lightweight flywheel can transform the car’s character. It is worth noting that Perrin headers are designed for the 2013–2020 BRZ, including later models with the FA20D engine; fitment for the 2022+ BRZ (with the FA24) is different and requires a separate product.

Reliability and Long-Term Use

Perrin headers have a strong track record for reliability. The 304 stainless steel resists cracking better than cheaper 409 stainless or mild steel. The welds hold up well under thermal cycling. Many owners report tens of thousands of miles without issues. However, because the header removes the factory primary catalytic converter (the header includes a high-flow cat? Actually, Perrin headers for BRZ are typically catless; they are intended for off-road use only in many states). This means the car will no longer pass smog testing in areas that check for visual presence of catalytic converters. Owners should verify local laws before installation.

Comparing Perrin Headers to Other Options

Several other manufacturers offer equal-length headers for the BRZ, including Tomei, JDL Auto Design, and Gruppe-S. Perrin stands out for its combination of quality, price, and customer support. The Tomei header, for instance, uses a more exotic design with stepped primaries for even more mid-range torque, but it is also more expensive. JDL Auto Design offers ceramic-coated options that are more expensive but provide better heat management out of the box. Perrin’s header is competitively priced while still using premium materials and welding. For the enthusiast who wants a proven upgrade without breaking the bank, Perrin is often the recommended choice.

When comparing material quality, Perrin’s 304 stainless, mandrel bends, and TIG welding match or exceed most competitors in its price bracket. Some ultra-budget headers use thinner steel and sloppy welds that can crack over time. Perrin’s fitment is also consistently praised—installers report that the flanges align with the cylinder head studs without forcing, which is not always true with cheaper options.

Tuning: Unlocking the Full Potential

As mentioned, a proper ECU tune is essential to realize the full benefits of Perrin headers. Popular tuning solutions for the BRZ include open-source tools like RomRaider with a Tactrix cable, or proprietary platforms like ECUTEK and COBB Accessport (though COBB’s support for the BRZ has changed in recent years). A tune can adjust fuel and ignition timing to match the improved exhaust flow, eliminate the post-header CEL, and often return better fuel economy during cruising. Many professional tuners offer base maps specifically for Perrin headers. It is highly recommended to get a tune from a reputable shop that has experience with the FA20 platform.

Without a tune, the car may experience a check engine light, and the ECU may run in a low-performance failsafe mode that reduces power. The car will run, but the gains from the headers will be muted, and there is a risk of a lean condition at high RPM. Factor the cost of tuning into the overall upgrade budget.

Conclusion

Perrin headers represent a well-engineered upgrade for any BRZ owner seeking meaningful performance gains in horsepower, torque, and throttle response. The use of premium 304 stainless steel, mandrel-bent tubing, and precision welding ensures that the headers will provide years of reliable service. While installation requires moderate mechanical skill and a tune is strongly recommended to avoid drivability issues, the end result is a car that drives more eagerly and sounds more aggressive. Whether you are building a track-day weapon or simply want to extract more enjoyment from your daily driver, investing in Perrin headers is a decision that rewards with every press of the throttle.

For further reading, explore Perrin’s official product page for specifications and ordering. Dyno charts and user reviews can be found on FT86Club forums and FT86 Speed Factory. For those considering tuning, ECUTEK offers supported solutions, and Tactrix provides open-source hardware. Always consult with a professional tuner to ensure your specific combination yields the best results.