Upgrading your Subaru BRZ with a race-inspired exhaust system is one of the most popular modifications among enthusiasts looking to boost both performance and auditory appeal. These systems are designed to reduce exhaust backpressure, enhance engine efficiency, and provide a more aggressive exhaust note that complements the sporty character of the BRZ. However, installing such an exhaust requires careful attention to detail to ensure optimal function, fitment, and longevity. This comprehensive guide will walk you through everything you need to know for a successful installation, from preparation to final adjustments.

Understanding the Benefits of a Race-Inspired Exhaust System on the Subaru BRZ

Before diving into the installation process, it's important to understand why upgrading to a race-inspired exhaust system can be beneficial for your Subaru BRZ:

  • Performance Gains: These exhaust systems typically feature larger diameter piping, smoother bends, and less restrictive mufflers or straight-through designs. This reduces exhaust backpressure, improving engine breathing and increasing horsepower and torque.
  • Enhanced Sound: Race-inspired exhausts produce a deeper, more aggressive exhaust note that enhances the driving experience without being overly loud or droning at cruising speeds.
  • Weight Reduction: Many aftermarket exhausts are constructed from lightweight materials such as stainless steel or titanium, reducing the overall weight of your vehicle and improving handling.
  • Aesthetic Appeal: Upgraded exhaust tips and polished finishes give your BRZ a sportier and more aggressive look.

Preparation Before Installation

Proper preparation is essential for a smooth installation process and to avoid potential issues down the road. Here are the steps to prepare effectively:

Gather the Correct Tools and Parts

Having the right tools on hand will save you time and frustration. Commonly needed tools include:

  • Socket wrench set (including deep sockets)
  • Combination wrenches
  • Penetrating oil (e.g., WD-40 or PB Blaster) for loosening rusted bolts
  • Jack stands and a hydraulic floor jack
  • Rubber mallet or hammer
  • Torque wrench for proper bolt tightening
  • Safety goggles and gloves
  • Exhaust hanger removal tool (optional but helpful)

Selecting the Right Exhaust System

Make sure the exhaust system you purchase is specifically designed for the Subaru BRZ (or the mechanically similar Toyota 86/Scion FR-S, if applicable). Systems vary in design, such as cat-back, axle-back, or full turbo-back exhausts, depending on your goals and budget. Some popular brands include HKS, Invidia, and GReddy. Read product reviews and watch installation videos to verify compatibility and quality.

Review Manufacturer Instructions

Every exhaust system will come with a set of installation instructions. Thoroughly read these before beginning. Manufacturers often provide specific torque specifications, assembly hints, and warnings that are critical for proper installation and warranty compliance.

Safety First

Safety should be your top priority throughout the installation process. Here are key safety considerations:

Work in a Well-Ventilated, Clean Workspace

Exhaust fumes are hazardous. Perform all work in a well-ventilated garage or outdoors to avoid inhaling dangerous gases. Ensure your workspace is clear of clutter and trip hazards.

Securely Lift the Vehicle

Use a hydraulic jack to raise the car, then place it securely on jack stands rated for your vehicle’s weight. Never rely on a jack alone to support the car while working underneath. Double-check stability before crawling beneath.

Wear Protective Gear

Protect your eyes and hands from debris, sharp edges, and hot surfaces. Use safety goggles and gloves. Avoid loose clothing that can get caught on components.

Allow Exhaust Components to Cool

Exhaust parts can become extremely hot during operation. Allow the car to cool completely before beginning removal to prevent burns.

Step-by-Step Installation Tips

1. Removing the Old Exhaust System

Begin by inspecting the existing exhaust system for rusted or seized bolts. Apply penetrating oil liberally to all fasteners and allow it to soak for 10–15 minutes. This will help prevent stripped bolts and make removal easier.

  • Disconnect Sensors: Carefully unplug any oxygen sensors or exhaust gas temperature sensors attached to the system. Use an oxygen sensor socket if needed to avoid damage.
  • Loosen Clamps and Bolts: Using the appropriate sockets and wrenches, loosen all clamps and bolts securing the exhaust. Take care not to round off bolt heads.
  • Support the Exhaust: Use a second person or a jack with a wood block to support the exhaust system as you remove mounting points to prevent it from falling abruptly.
  • Remove Exhaust Hangers: Use an exhaust hanger tool or carefully pry the rubber mounts off the metal hangers. These can become brittle with age, so work gently to avoid tearing.
  • Lower the Old Exhaust: Once free, carefully lower and remove the old exhaust system from under the car.

2. Preparing the New Exhaust System

Before installation, unpack the new exhaust components and verify that all parts are present according to the manufacturer’s parts list. Lay them out to visualize the assembly sequence.

  • Inspect for Damage: Check for dents, cracks, or missing welds.
  • Test Fit Sections: Dry fit the components together to ensure proper alignment and fitment.
  • Apply Anti-Seize: Lightly coat bolts and threads with anti-seize lubricant to prevent future rust and make removal easier.
  • Replace Exhaust Gaskets: If your system uses gaskets at the flange connections, use new gaskets to ensure a proper seal.

3. Installing the New Exhaust System

Installation is generally performed from front to rear to ensure proper alignment and ease of assembly.

  • Attach Front Section: Begin with the section closest to the exhaust manifold or catalytic converter. Use new gaskets and loosely tighten bolts to allow for adjustment.
  • Connect Mid-Pipes and Mufflers: Continue connecting subsequent sections, using clamps or flanges as specified. Leave bolts and clamps slightly loose until the entire system is mounted.
  • Hang the Exhaust: Reattach exhaust hangers to the rubber mounts on the chassis. Ensure the system is well supported to prevent sagging or stress on joints.
  • Tighten Fasteners: Once all components are in place and aligned, torque all bolts and clamps to the manufacturer’s recommended specifications using a torque wrench.
  • Check Clearance: Verify that the exhaust system has sufficient clearance from the chassis, suspension components, brake lines, and fuel lines to prevent rattling or heat damage.

4. Aligning the Exhaust Properly

Proper alignment is crucial to avoid noise and premature wear caused by vibrations or contact with other parts.

  • Visual Inspection: Look along the length of the exhaust to confirm it runs parallel to the ground and body panels.
  • Check Tip Position: The exhaust tip should extend slightly beyond the rear bumper or diffuser but not so far as to cause potential damage.
  • Ensure No Contact Points: Wiggle the exhaust gently and listen for any rubbing or knocking noises.

5. Checking for Leaks and Final Adjustments

Once installation is complete, it’s essential to verify that the system is sealed correctly and functioning as intended.

  • Start the Engine: With the vehicle safely on the ground, start the engine and listen closely for any exhaust leaks, which will often manifest as hissing or popping sounds near joints.
  • Feel for Leaks: Carefully place your hand near joints (without touching hot parts) to detect escaping exhaust gases.
  • Retighten as Needed: If leaks are found, tighten clamps or bolts incrementally until the leak is resolved.
  • Check for Unusual Noises: Listen for rattles or vibrations that may indicate loose hangers or improper contact.

Post-Installation Recommendations

Test Drive and Monitor Performance

Take your Subaru BRZ for a moderate test drive to experience the new sound and performance improvements. Pay attention to any unusual noises, vibrations, or changes in engine behavior.

Inspect Regularly

After installation, regularly inspect the exhaust system for signs of wear, loose clamps, or damage, especially if you participate in track days or spirited driving sessions. Heat cycles and vibration can loosen fasteners over time.

Consider ECU Tuning

Depending on the extent of your exhaust upgrade, especially if paired with other performance modifications such as intake or forced induction, consider an ECU tune to optimize air-fuel ratios and maximize horsepower gains.

Maintain Emissions Compliance

Check your local regulations regarding emissions and noise restrictions. Some race-inspired exhaust systems may alter emissions output, so ensure your vehicle remains street-legal if you plan to drive it daily.

Common Challenges and Troubleshooting

Even with careful installation, you may encounter a few challenges. Here are some common issues and how to address them:

  • Rusted or Broken Bolts: Use penetrating oil and a breaker bar. If bolts are severely corroded, you may need to cut them off and replace with new hardware.
  • Exhaust Leak at Flanges: Replace gaskets and ensure bolts are torqued evenly. Sometimes applying exhaust sealant can help.
  • Rattling Noise: Check all hangers for tightness and integrity. Replace worn rubber mounts if needed.
  • Excessive Drone: Some aftermarket exhausts produce droning at certain RPMs. Choosing a system with a resonator or using sound-deadening materials can mitigate this.

Additional Upgrades to Complement Your Race-Inspired Exhaust

To fully capitalize on your new exhaust system, consider pairing it with other modifications that enhance performance and reliability:

  • High-Flow Catalytic Converters: Improve exhaust flow while maintaining emissions compliance.
  • Cold Air Intake Systems: Increase the engine’s air intake volume for better combustion.
  • Performance Spark Plugs: Ensure optimal ignition for the increased airflow.
  • Suspension Upgrades: Enhance handling to match your increased engine output.
  • ECU Remapping: Calibrate your engine management system for the new exhaust dynamics.

Conclusion

Installing a race-inspired exhaust system on your Subaru BRZ is a rewarding upgrade that can significantly enhance your vehicle’s performance, sound, and aesthetic appeal. With careful preparation, attention to safety, and a methodical installation process, you can ensure that your new exhaust system operates efficiently and reliably for many miles to come. Regular maintenance and inspections, combined with complementary performance upgrades, will help you get the most out of your investment while enjoying the thrilling driving experience that the Subaru BRZ is known for.