Upgrading the exhaust system on a Subaru BRZ by replacing the stock exhaust with a sport exhaust is a favored modification among automotive enthusiasts. This upgrade not only enhances the car’s auditory appeal with a deeper, more aggressive sound but can also improve engine performance by optimizing exhaust flow. Additionally, a sport exhaust often contributes to a more striking visual presence, elevating the overall aesthetic of the vehicle. While the benefits are clear, understanding the expected time required for this replacement is essential for proper planning, budgeting, and ensuring a smooth installation process.

Why Replace the Stock Exhaust on a Subaru BRZ?

The Subaru BRZ comes from the factory equipped with a stock exhaust system designed to balance noise regulations, emissions standards, and performance. However, many owners seek a sport exhaust upgrade for several reasons:

  • Improved Sound: Sport exhausts provide a more aggressive and sporty exhaust note, enhancing the driving experience.
  • Performance Gains: By reducing backpressure and improving exhaust gas flow, sport exhausts can offer slight horsepower and torque improvements.
  • Weight Reduction: Aftermarket sport exhausts often use lighter materials such as stainless steel or titanium, reducing overall vehicle weight.
  • Visual Enhancement: Sport exhausts frequently feature polished tips and distinctive designs that add to the car’s visual appeal.

Given these advantages, upgrading the exhaust is a popular and rewarding modification. However, the installation process requires some effort and planning.

Key Factors Influencing Installation Time

The time it takes to replace the stock exhaust with a sport exhaust on a Subaru BRZ can vary widely depending on several important factors:

1. Mechanic’s Experience Level

Professional mechanics with experience in exhaust system installations typically complete the job faster than DIY enthusiasts. Their familiarity with the vehicle’s design, exhaust component layout, and common challenges reduces time spent on troubleshooting or adjustments.

2. Type of Sport Exhaust System

Sport exhaust systems come in different configurations, including cat-back, axle-back, or full exhaust setups. Each type requires varying installation complexity:

  • Cat-back systems: Replace the exhaust from the catalytic converter back. These are generally easier and quicker to install.
  • Axle-back systems: Replace only the rear portion, often the muffler and tips, which can be the simplest and fastest.
  • Full exhaust systems: Replace the entire exhaust including headers, mid-pipes, and mufflers. These are more complex and time-consuming.

Custom or high-performance systems may also require additional tuning or fabrication, extending installation time.

3. Condition of the Stock Exhaust and Vehicle

Rusted or seized bolts, damaged hangers, or prior modifications can complicate removal of the stock exhaust. Additional time may be needed to cut bolts, replace hangers, or address corrosion.

4. Additional Modifications or Upgrades

Some installations include adding components such as high-flow catalytic converters, resonators, or electronic exhaust valves. These additions will increase the installation duration.

Estimated Installation Duration

Professional Installation Time

When performed by an experienced mechanic at a well-equipped shop, replacing the stock exhaust with a sport exhaust on a Subaru BRZ typically takes between 1 to 3 hours. This estimate assumes:

  • The exhaust system is a straightforward cat-back or axle-back setup.
  • The stock exhaust components are in good condition and removal is smooth.
  • No additional modifications, repairs, or tuning are required.

Many shops include a test drive after installation to ensure proper fitment and sound quality, which may add a short amount of time.

DIY Installation Time

Car enthusiasts who choose to install the sport exhaust themselves should expect the process to take longer, generally between 3 to 6 hours. This extended time accounts for:

  • Gathering and organizing tools and parts.
  • Carefully following installation instructions or video guides.
  • Dealing with potential complications such as stuck bolts or tight clearances.
  • Testing fitment and making adjustments.

For first-time installers, additional time may be required to become familiar with the vehicle’s undercarriage and exhaust layout. Having a helper can significantly reduce labor time and improve safety.

Step-by-Step Overview of the Installation Process

Understanding the general steps involved in replacing the exhaust can help set realistic time expectations and prepare for the task:

1. Preparation

  • Park the vehicle on a flat, stable surface and engage the parking brake.
  • Gather all necessary tools including a car jack, jack stands, ratchets, wrenches, penetrating oil, and safety glasses.
  • Allow the exhaust system to cool completely to avoid burns.
  • Review the sport exhaust manufacturer’s installation instructions thoroughly.

2. Raising the Vehicle

Use a jack to lift the rear or entire vehicle and secure it with jack stands. This provides safe and adequate access to the exhaust components underneath.

3. Removing the Stock Exhaust

  • Spray penetrating oil on bolts and hangers to loosen rusted fasteners.
  • Unbolt clamps and flange nuts connecting the exhaust system.
  • Carefully detach the exhaust from rubber hangers, using a pry tool if necessary.
  • Remove the entire stock exhaust assembly from the vehicle.

4. Installing the Sport Exhaust

  • Position the new exhaust components in place, starting from the front connection point and moving rearward.
  • Secure the exhaust to the hangers and loosely fasten clamps and bolts.
  • Ensure proper alignment and clearance from the vehicle’s underbody and suspension components.
  • Tighten all bolts and clamps to manufacturer-specified torque values.

5. Final Checks

  • Lower the vehicle safely off the jack stands.
  • Start the engine and listen for leaks or rattles.
  • Inspect the exhaust system visually to confirm secure mounting and clearance.
  • Take a short test drive to verify performance and sound.

Preparation Tips for a Smoother Installation

  • Have the Right Tools Ready: Essential tools include a hydraulic jack, sturdy jack stands, various socket sizes, ratchets, penetrating oil, torque wrench, and protective gloves.
  • Consult Manufacturer Instructions: Each sport exhaust system may have unique installation steps or hardware. Following the provided guide reduces errors and installation time.
  • Work with a Partner: Having an extra set of hands makes lifting and aligning heavy exhaust components easier and safer.
  • Prepare for Rusted or Stuck Bolts: Penetrating oil applied ahead of time and having a breaker bar or impact wrench can save frustration.
  • Allocate Extra Time: Unexpected challenges like misfit components or damaged hangers can extend the project. Planning for additional time avoids rushing.

Common Challenges and How to Overcome Them

Rust and Corrosion

Subaru BRZs used in regions with harsh winters or coastal environments often have rusty exhaust bolts and hangers. Penetrating oil should be applied generously and allowed to soak. In stubborn cases, carefully cutting bolts with a reciprocating saw may be necessary.

Fitment Issues

Although most aftermarket sport exhausts are designed to be direct replacements, slight variances in manufacturing can cause fitment challenges. Trial fitting parts before final tightening, or consulting forums and manufacturer support can assist.

Exhaust Leaks

If leaks are detected after installation, double-check clamp tightness and gasket condition. In some cases, exhaust sealant or new gaskets may be required.

Additional Considerations

Before upgrading the exhaust system, verify local laws and emissions regulations. Some sport exhausts may not be street legal or could affect emissions test results.

Tuning and ECU Adjustments

While many sport exhaust upgrades are bolt-on, some high-performance systems benefit from ECU tuning to optimize fuel mapping and maximize power gains. This can add time and cost but improves overall results.

Cost Implications

Professional installation costs vary by shop but typically range from $100 to $300 depending on labor rates and system complexity. DIY installation reduces labor costs but requires investment in tools and time.

Conclusion

Replacing the stock exhaust with a sport exhaust on a Subaru BRZ is a highly rewarding modification that can enhance sound, performance, and aesthetics. The installation time varies based on the type of exhaust system, condition of the vehicle, and installer experience. Professional mechanics can often complete the job within 1 to 3 hours, while DIY enthusiasts should budget 3 to 6 hours or more to accommodate preparation and unexpected challenges.

Proper planning, having the right tools, and understanding the installation process will ensure a smoother experience and help you enjoy your upgraded exhaust system sooner. Whether in a professional garage or your own driveway, this upgrade represents a meaningful improvement to your Subaru BRZ driving experience.