Introduction to Exhaust System Upgrades for the Acura Integra GS-R

The Acura Integra GS-R is a beloved model among car enthusiasts, especially those who appreciate its balance of performance, reliability, and tunability. One of the most popular and impactful modifications for the Integra GS-R is upgrading the exhaust system. Enhancing the exhaust not only improves the engine’s efficiency and power output but also allows for a more aggressive and pleasing exhaust note, giving your vehicle a distinctive character on the road.

This comprehensive guide will walk you through the entire process of upgrading the exhaust system on your Acura Integra GS-R, covering everything from the basics of exhaust design to the step-by-step installation process, and tips for choosing the best components for your build.

Understanding the Exhaust System and Its Impact on Performance

What Does the Exhaust System Do?

The exhaust system is responsible for directing harmful gases produced during combustion out of the engine and away from the vehicle. It also helps reduce noise, controls emissions, and influences engine efficiency. A well-designed exhaust system can reduce backpressure, allowing the engine to expel exhaust gases more efficiently, which translates to better horsepower and torque.

Key Components of the Exhaust System

  • Exhaust Manifold/Header: Collects exhaust gases from the engine cylinders and funnels them into the exhaust pipe. Upgrading to performance headers can improve exhaust flow significantly.
  • Mid-Pipe: Connects the header to the muffler; may include catalytic converters or resonators.
  • Catalytic Converter: Reduces harmful emissions; some enthusiasts opt for high-flow catalytic converters or delete them depending on regulations.
  • Muffler: Reduces exhaust noise; aftermarket mufflers can alter sound and performance.
  • Exhaust Tips: Mostly aesthetic, but can affect the sound slightly.

Benefits of Upgrading the Exhaust on the Integra GS-R

  • Increased Horsepower and Torque: By reducing backpressure and improving exhaust scavenging.
  • Improved Sound: More aggressive and sporty exhaust notes.
  • Weight Reduction: Performance exhaust components are often lighter than stock parts.
  • Enhanced Aesthetics: Sleek exhaust tips and polished pipes can improve the car’s appearance.

Choosing the Right Exhaust System for Your Acura Integra GS-R

Selecting the right exhaust setup depends on your goals, budget, and local regulations. Here are some common types of exhaust systems to consider:

Cat-Back Exhaust Systems

This system replaces everything from the catalytic converter back to the exhaust tip. It’s a popular choice because it’s relatively easy to install, improves performance, and usually keeps emissions legal.

Header-Back Exhaust Systems

This involves replacing the headers along with the rest of the exhaust system. Headers can significantly improve exhaust flow but may be more complicated to install and may require tuning.

Axle-Back Exhaust Systems

This is a simpler upgrade that replaces only the exhaust components behind the rear axle, typically just the muffler and tips. It’s easier to install but offers less performance gain.

High-Flow Catalytic Converters

If your goal is to maintain emissions compliance while gaining performance, upgrading to a high-flow catalytic converter is a good middle ground. Some enthusiasts remove the cat entirely (cat delete), but this is illegal in many areas and can cause issues with engine management systems.

Tools and Materials Needed for the Exhaust Upgrade

  • New exhaust components (headers, mid-pipe, muffler, tips)
  • Jack and jack stands or a vehicle lift
  • Socket wrench set with extensions
  • Penetrating oil (e.g., WD-40) for rusted bolts
  • Exhaust gasket replacement
  • Anti-seize compound
  • Torque wrench
  • Safety glasses and gloves
  • Rubber mallet (optional)
  • Exhaust hanger removal tool (optional but helpful)

Step-by-Step Guide to Upgrading the Exhaust System on the Acura Integra GS-R

Step 1: Preparation and Safety

Before beginning any work, park your car on a level surface and ensure the engine is completely cool to avoid burns. Use a jack to lift the vehicle and securely place it on jack stands or use a vehicle lift if available. Always wear safety glasses and gloves to protect yourself from dirt, rust, and metal shards.

Step 2: Inspect the Existing Exhaust System

Examine your current exhaust system for rust, damage, or leaks. Note the mounting points and how the system is connected. Spray penetrating oil on all bolts and nuts to make removal easier, especially if the exhaust is old or rusted.

Step 3: Remove the Old Exhaust System

  • Start by unbolting the exhaust from the catalytic converter or the flange connecting to the headers, depending on your upgrade scope.
  • Remove exhaust hangers by hand or with an exhaust hanger removal tool.
  • Carefully lower the exhaust system and remove it from under the car.
  • Keep all hardware if you plan to reuse it, but it’s often recommended to replace bolts and gaskets.

Step 4: Prepare the New Exhaust Components

  • Compare the new parts to the old system to ensure correct fitment.
  • Apply anti-seize compound to all bolts to prevent future rusting and make installation easier.
  • Install new gaskets where necessary to prevent leaks.

Step 5: Install the New Exhaust System

  • Begin at the front of the exhaust system, attaching headers or the flange to the catalytic converter first.
  • Attach the mid-pipe and muffler sections next, loosely bolting everything to allow for adjustment.
  • Reconnect exhaust hangers to properly support the new system.
  • Once all pieces are aligned and fit correctly, tighten all bolts to the manufacturer’s specified torque using a torque wrench.

Step 6: Check for Leaks and Secure Fitment

Start the engine and listen for any exhaust leaks or rattles. If you detect leaks, inspect the gaskets and tighten connections. Adjust the exhaust hangers if there is excessive movement or contact with the undercarriage.

Step 7: Final Inspection and Test Drive

After confirming there are no leaks and the system is securely mounted, take the car for a test drive. Pay attention to the exhaust sound, performance, and any unusual vibrations. After the test, recheck all bolts and hangers and retighten if necessary.

Additional Tips for Maximizing Your Exhaust Upgrade

  • Consider ECU Tuning: Upgrading the exhaust can change your engine’s airflow characteristics. A custom ECU tune can optimize air-fuel ratios and ignition timing to fully capitalize on your new exhaust system’s performance potential.
  • Pair With Intake Upgrades: To maximize power gains, consider upgrading the intake system alongside the exhaust to improve overall airflow.
  • Check Emissions Regulations: Always ensure your modifications comply with local laws, especially concerning catalytic converters and noise limits.
  • Regular Maintenance: Inspect the exhaust system periodically for rust and damage. Clean the tips and check for loose components.

When selecting parts, quality matters. Here are some trusted brands known for producing excellent exhaust components compatible with the Integra GS-R:

  • Skunk2 Racing – Known for high-performance headers and cat-back systems.
  • Invidia – Offers stainless steel cat-back exhausts with aggressive sound profiles.
  • Borla – Renowned for durable, high-quality exhaust systems.
  • HKS – Provides performance headers and exhaust systems tailored for Japanese cars.
  • Greddy – Offers a variety of exhaust components designed to improve power and sound.

Conclusion

Upgrading the exhaust system on your Acura Integra GS-R is one of the most effective ways to enhance both performance and driving enjoyment. Whether you’re looking for a subtle sound improvement or a full race-inspired exhaust setup, following this step-by-step guide will help ensure a smooth installation and optimal results. Investing in quality components and considering complementary modifications like ECU tuning and intake upgrades can further maximize the benefits of your new exhaust system. Always prioritize safety, legality, and proper maintenance to keep your Integra running strong and sounding great for years to come.