Tools and Materials Needed

Before diving into the installation, having the right tools and materials on hand is critical for a smooth and safe process. The Perrin Evo Exhaust system itself is the main component, but you'll also need a standard socket set (metric sizes typically), a set of combination wrenches, and a torque wrench to ensure bolts are tightened to specification. A jack and a pair of jack stands are essential for safely lifting and supporting the vehicle. Don't forget safety glasses and gloves—exhaust work often involves rust, dirt, and sharp edges. An anti-seize compound (copper-based is common) will prevent bolts from seizing due to heat and corrosion in the future. Additionally, a penetrating lubricant like WD-40 or PB Blaster can help loosen stubborn bolts. A rubber mallet may be useful for freeing stuck hangers. Finally, having a shop vacuum handy to clean up debris before disconnecting the exhaust is a smart move.

  • Perrin Evo Exhaust system (complete with gaskets and hardware)
  • Socket set with extensions (metric, usually 10mm, 12mm, 14mm, 17mm)
  • Combination wrench set (same range)
  • Torque wrench (capable of 20-80 ft-lbs)
  • Jack and jack stands (rated for your vehicle weight)
  • Safety glasses and mechanic gloves
  • Anti-seize compound
  • Penetrating oil (e.g., PB Blaster)
  • Rubber mallet
  • Shop rags and vacuum

Preparation Steps

Proper preparation prevents poor performance—and safety hazards. Park the vehicle on a level concrete surface. Engage the parking brake firmly, and consider chocking the rear wheels for extra security. Disconnect the negative terminal of the battery to prevent any accidental short circuits while working near electrical components (especially if your vehicle has an electronic parking brake or sensors near the exhaust). Allow the exhaust system to cool completely if the vehicle has been running; hot exhaust components can cause severe burns.

Using the jack, lift the rear of the vehicle high enough to provide comfortable clearance underneath. Place jack stands under the designated lift points (refer to your vehicle’s service manual). Never rely solely on a jack. Once the vehicle is safely supported, double-check stability by giving it a gentle shake. Now, spray penetrating oil on all exhaust bolts and hanger studs that will be removed; let it soak for at least 10-15 minutes to break down rust and corrosion.

Removing the Stock Exhaust

Removing the factory exhaust system is the most labor-intensive step. Start by locating the exhaust hangers—rubber isolators that support the exhaust along its length. Using a wrench or pliers, compress or slide the hangers off the mounting pins. A rubber mallet can help dislodge stubborn hangers. Next, identify the flange bolts connecting the stock exhaust to the catalytic converter or downpipe. These bolts are often corroded; apply additional penetrating oil if needed. Use a socket and breaker bar to break them loose, then remove them by hand.

Carefully support the stock exhaust (you may need a helper or a second jack) as you unbolt any mid-pipe connections. Lower the exhaust system gradually, ensuring it does not catch on the rear axle, differential, or other underbody components. Once free, slide it out from under the vehicle. Inspect the old exhaust for rust, cracks, or damaged hangers. Replace any worn rubber hangers with new ones supplied with the Perrin kit or purchased separately. Keep the original hardware (bolts, nuts, washers) that are in good condition—some may be reused or needed as spares. Wipe down the mounting points on the vehicle to remove dirt and debris.

Torquing and Alignment Precautions

When reinstalling, proper torque is essential. Under-tightening can cause leaks and rattles; over-tightening can strip threads or crush gaskets. Perrin typically provides torque specifications in the kit instructions—commonly 30-40 ft-lbs for flange bolts. Use a torque wrench set to the recommended value. Additionally, ensure the exhaust system is not under tension; loosely install all fasteners first, then adjust the position so the exhaust sits evenly with clearance from the underbody, driveshaft, and suspension components. Tighten in a cross-pattern where applicable. Applying anti-seize to all bolt threads will make future removal easier and prevent galvanic corrosion between stainless steel and mild steel parts.

Installing the Perrin Evo Exhaust

With the stock exhaust removed, you can now install the Perrin Evo system. Lay out all the components and verify you have the correct parts: usually a muffler section, intermediate pipe, and hardware. Inspect the included gaskets (often high-quality multi-layer steel or graphite) and ensure they match the flange patterns.

Begin by positioning the intermediate pipe against the catalytic converter flange. Insert the gasket between the flanges, then hand-tighten the bolts. Do not fully tighten yet—allow some movement for alignment. Slide the rubber hangers onto the chassis mounting points first, then attach the exhaust to the hangers. The Perrin Evo system typically uses high-quality silicone or heavy-duty rubber hangers that are more durable than stock. Use a rubber mallet if needed to seat them.

Connect the muffler section to the intermediate pipe, again using a new gasket. Hand-tighten the bolts. Step back and check the overall alignment: the exhaust tip should be centered in the bumper cutout and parallel to the ground. Adjust by gently nudging the pipes or repositioning hangers. Once satisfied, tighten all flange bolts to the specified torque. Then, tighten the hanger bolts (if any) and re-check that no part of the exhaust contacts the chassis, heat shields, or moving components. Finally, apply a small amount of anti-seize to the exposed threads of the bolts.

Sound and Performance Considerations

The Perrin Evo exhaust is designed to improve exhaust flow, reducing backpressure and allowing the engine to breathe more freely. This typically results in gains of 5-15 horsepower and similar torque increases, depending on your vehicle and other modifications. The sound profile is deeper and more aggressive than stock, but still civilized for daily driving—no drone at highway speeds. If you desire an even louder note, consider pairing the exhaust with a catless downpipe or high-flow catalytic converter (check local emissions laws). For a tamer sound, the Perrin exhaust can be combined with the stock catalytic converter, as the system is designed to bolt directly to the factory cat flange.

Some enthusiasts note that the exhaust note continues to mature over the first few hundred miles as the packing material settles. This is normal. Keep your ear out for any unreasonable hissing or ticking, which could indicate a leak at the gaskets. If heard, re-torque the flange bolts and ensure the gasket is seated evenly.

Final Steps

After the exhaust is tight and aligned, reassemble any heat shields or underbody panels you may have removed. Reconnect the negative battery terminal. Start the engine and let it idle. Listen for any rattles, hisses, or metallic contact. Walk around the vehicle and inspect all joints for exhaust leaks—a small amount of soapy water sprayed around flanges can help detect bubbles if you suspect a leak. Rev the engine gently and listen again. If everything sounds tight, perform a road test. Drive through a variety of speeds and load conditions, paying attention to drone, clarity, and any vibrations. If you notice a rattle, re-check the clearance between the exhaust and the underbody (especially near the spare tire well or rear crossmember). After the test, re-torque the flange bolts once more—heat cycling can cause bolts to loosen slightly. Lower the vehicle carefully from the jack stands and remove the jack.

Benefits of Upgrading to a Perrin Evo Exhaust

Upgrading to a Perrin Evo exhaust delivers more than just a new sound. The system is engineered with mandrel-bent tubing to maintain consistent inner diameter, reducing flow restrictions compared to stock crimp-bent pipes. The use of 304 stainless steel ensures corrosion resistance and a polished, sporty appearance. Many owners report noticeable gains in throttle response and mid-range torque, especially on turbocharged platforms like the Subaru WRX/STI or Toyota GR Corolla (check vehicle compatibility). The exhaust is also significantly lighter than the stock system, reducing unsprung weight and improving handling dynamics. Additionally, the high-quality welds and robust hangers eliminate the common issue of exhaust sag overtime. For track or autocross use, the improved flow contributes to lower exhaust gas temperatures, supporting sustained high-rpm performance. The Perrin Evo exhaust is a popular choice among enthusiasts for its balance of performance, durability, and sound tuning.

Maintenance and Longevity Tips

To keep your Perrin Evo exhaust performing and looking great, perform periodic inspections. After every season or 5,000 miles, check the condition of the hangers and tighten any loose bolts. Clean the exhaust tips with a non-abrasive metal polish to prevent pitting from road salt or moisture. If you live in a region with harsh winters, consider applying a corrosion-inhibiting spray (like ACF-50) to the underside of the exhaust components—though stainless steel resists rust, the welds and attachment points can still be vulnerable. Avoid using acidic wheel cleaners near the exhaust, as they can discolor the finish. If you hear a developing rattle, inspect the heat shields and hangers first; they are the most common sources. Finally, if you plan to sell the vehicle, the Perrin exhaust is easily removed and the stock system reinstalled, allowing you to recover value or transfer the exhaust to your next vehicle (provided the flanges match).

Frequently Asked Questions

Will this exhaust cause a check engine light? In most cases, no. The Perrin Evo exhaust is designed to bolt directly to the stock catalytic converter location, maintaining the factory O2 sensor placement. However, if you pair it with a downpipe that removes the catalytic converter, you may need a tune or O2 sensor spacer to avoid a CEL.

Can I install this exhaust alone? While possible, it is strongly recommended to have a second person to help align the system and support the pipes during installation. The intermediate pipe can be awkward to handle alone.

Does the Perrin Evo exhaust fit all models? No, the exhaust is application-specific. Always verify vehicle fitment (year, make, model, engine) before purchasing. Perrin publishes detailed compatibility charts on their website and official Perrin site.

How long does the installation take? For a first-timer, expect 2-3 hours. Experienced mechanics can complete the job in about 1-1.5 hours.

What is the warranty on the Perrin Evo exhaust? Perrin typically offers a limited lifetime warranty against manufacturing defects. Check your specific product documentation or Perrin’s warranty policy for details.

Conclusion

Installing a Perrin Evo exhaust is a rewarding upgrade that enhances both the sound and performance of your vehicle. By following this detailed guide, using the correct tools, and adhering to torque specifications and alignment checks, you can achieve a professional-quality installation in your own garage. The benefits—increased horsepower, improved throttle response, weight reduction, and a more aggressive exhaust note—make it a top choice for driving enthusiasts. Remember to perform periodic maintenance to extend the life of the system and keep it looking and sounding its best. For further reading on exhaust theory and performance tuning, resources like Engine Builder Magazine and NASIOC forums offer community insights and technical discussions. Whether you’re a weekend warrior or a daily driver, the Perrin Evo exhaust delivers a tangible upgrade that you’ll appreciate every time you turn the key.