Upgrading the exhaust system on your Mitsubishi Lancer GT is one of the most effective modifications you can make to enhance both the vehicle’s performance and auditory appeal. A carefully selected and properly installed exhaust system can unlock additional horsepower, improve torque delivery, and provide a more aggressive, sporty exhaust note that complements the Lancer GT’s dynamic character. Whether you're a daily driver looking for a subtle improvement or an enthusiast seeking maximum performance gains, understanding the process of upgrading your exhaust system will help you achieve the best results.

Understanding the Benefits of an Exhaust System Upgrade

The factory exhaust system on the Mitsubishi Lancer GT balances emissions, noise regulations, and cost efficiency, which can limit performance potential. Upgrading to an aftermarket exhaust system offers several advantages:

  • Increased Horsepower and Torque: Aftermarket exhausts reduce backpressure, allowing exhaust gases to exit more efficiently. This improved flow enhances engine breathing, leading to better combustion and power output.
  • Enhanced Sound: Many enthusiasts desire a deeper, more aggressive exhaust note. Upgraded systems provide a richer tone without excessive drone, contributing to a more engaging driving experience.
  • Weight Reduction: Performance exhaust systems often use lighter materials such as stainless steel or titanium, which help reduce overall vehicle weight and improve handling.
  • Improved Fuel Efficiency: By optimizing exhaust flow, the engine can operate more efficiently, potentially improving fuel economy under certain driving conditions.

Before starting your upgrade, it’s crucial to understand the different types of exhaust systems and how they impact performance and sound.

Types of Exhaust Systems for the Mitsubishi Lancer GT

  • Axle-Back Exhaust: This system replaces the components from the rear axle to the exhaust tip. It is the simplest upgrade, focusing mostly on sound enhancement and minor weight savings, while retaining the stock catalytic converter and mid-pipe.
  • Cat-Back Exhaust: This system replaces everything from the catalytic converter back, including the mid-pipe and muffler. It offers a better balance of performance gains and sound improvement, making it a popular choice for enthusiasts.
  • Header-Back Exhaust: This comprehensive upgrade replaces the entire exhaust system, including the headers, catalytic converter, mid-pipe, and muffler. It provides the most significant performance gains but may require tuning and could affect emissions compliance.
  • Turbo-Back Exhaust: Specific to turbocharged models like the Lancer GT, this system replaces the exhaust from the turbo outlet back. It reduces backpressure and improves turbo spool time, maximizing power delivery.

Choosing the right system depends on your goals, budget, and local emissions laws. For street-driven Lancer GTs, a cat-back or axle-back system is typically sufficient to improve sound and performance without major modifications.

Step 1: Choose the Right Exhaust System

Selecting the perfect exhaust system is the foundation of your upgrade. Consider the following factors:

  • Material: Stainless steel is highly recommended for its corrosion resistance and durability. Some high-end systems use titanium for its lightweight properties, but it comes at a premium cost.
  • Sound Profile: Manufacturers often provide sound clips or descriptions. Decide if you want a subtle growl, moderate rumble, or aggressive roar.
  • Compatibility: Ensure the exhaust system is designed or confirmed compatible with the 2.0L turbocharged engine in the Lancer GT to avoid fitment issues.
  • Emissions Compliance: Verify if the system is CARB-compliant or meets local emissions regulations to avoid legal issues.
  • Brand Reputation and Warranty: Choose reputable brands that offer warranties and good customer support.

Popular aftermarket exhaust brands for the Mitsubishi Lancer GT include Injen, GReddy, HKS, and Borla. Each offers different sound characteristics and build qualities.

Step 2: Gather Necessary Tools and Equipment

Before beginning the installation, collect all required tools and safety equipment to ensure a smooth process:

  • Jack and Jack Stands: For safely lifting and supporting your vehicle.
  • Socket Wrench Set: Including metric sockets, extensions, and possibly a breaker bar for stubborn bolts.
  • Penetrating Oil (e.g., WD-40): To loosen rusted or seized bolts.
  • New Gaskets and Clamps: These typically come with your exhaust kit but verify beforehand.
  • Rubber Mallet: To gently persuade tight fittings.
  • Torque Wrench: Ensures bolts are tightened to manufacturer specifications.
  • Safety Gear: Safety glasses, gloves, and protective clothing to prevent injury.
  • Exhaust Hanger Removal Tool: Optional but helpful for detaching rubber hangers.

Having everything ready before starting reduces downtime and frustration during the installation.

Step 3: Prepare Your Vehicle

Ensure your Mitsubishi Lancer GT is parked on a flat, stable surface. Engage the parking brake and place wheel chocks behind the rear wheels for added safety. Allow the car to cool if it has been running, as exhaust components can become extremely hot.

Raise the vehicle using the jack and carefully position jack stands under the recommended lift points found in your owner’s manual. Never rely solely on the jack to support the car during work.

Step 4: Remove the Old Exhaust System

Start the removal process by applying penetrating oil to all exhaust bolts, nuts, and clamps, especially those connecting the exhaust system to the catalytic converter and mid-pipe. Allow the oil to soak in for 10-15 minutes to help ease removal.

Work from the rear of the vehicle towards the front, beginning with the exhaust tips, muffler, and mid-pipe sections. Use your socket wrench to unbolt the hardware carefully. Some bolts may be rusted or seized; use a breaker bar or impact wrench if necessary, but take care not to damage surrounding parts.

Detach the exhaust system from the rubber hangers using the exhaust hanger removal tool or by carefully prying. Retain any hardware that is reusable, and note the orientation of components for reference during installation.

Once the old exhaust is free, carefully lower it and set it aside. Inspect the exhaust flanges, hangers, and mounting points for damage or excessive wear, replacing components as needed.

Step 5: Install the New Exhaust System

Before installation, compare the new exhaust components with the old system to confirm fitment and identify any differences.

Begin installation by loosely assembling the system starting at the front, typically the header or downpipe flange. Place new gaskets between mating surfaces to ensure a proper seal and prevent exhaust leaks.

Hand-tighten bolts and clamps to allow for adjustments during alignment. Continue assembling the exhaust sections towards the rear of the vehicle, ensuring each joint is properly seated.

Once the entire system is in place and aligned, check for adequate clearance from the undercarriage, suspension components, and heat-sensitive parts such as brake lines and fuel tanks. The exhaust should not contact any part of the vehicle to avoid rattling or premature wear.

Tighten all bolts and clamps to the manufacturer’s recommended torque specifications using a torque wrench. Over-tightening can damage flanges or strip threads, while under-tightening can lead to leaks.

Attach the exhaust hangers securely to support the weight of the new system and reduce vibrations.

Step 6: Inspect and Test Your New Exhaust

Before lowering your vehicle, perform a thorough inspection of the installed exhaust system:

  • Check for loose hardware and confirm all clamps and bolts are tightened correctly.
  • Verify that all gaskets are seated properly and no visible gaps exist.
  • Ensure there is adequate clearance from the ground and vehicle components.

Slowly lower your Lancer GT back to the ground and start the engine. Listen attentively for any signs of exhaust leaks such as hissing or popping sounds, which indicate escaping gases.

Inspect underneath the vehicle with the engine running to spot any visible leaks—look for soot marks or feel for escaping air around joints and flanges.

During initial startup, the exhaust system may emit a mild odor due to manufacturing oils burning off; this is normal and should dissipate quickly.

Step 7: Break-In Period and Fine-Tuning

Allow the new exhaust system a break-in period of approximately 100-200 miles. During this time, periodically check for any developing leaks or loose components, as thermal expansion and contraction may affect seals and bolts.

For turbocharged Lancer GT models, consider a professional dyno tune after installing a header-back or turbo-back exhaust system. Tuning ensures the engine management system optimizes fuel delivery and timing to take full advantage of the upgraded exhaust, maximizing power and reliability.

Additional Tips for Exhaust Upgrades on the Mitsubishi Lancer GT

  • Consider Combining Upgrades: Pair your exhaust upgrade with an intake system, intercooler, or ECU tuning to unlock further performance gains.
  • Legal Considerations: Check local noise ordinances and emissions regulations to ensure your exhaust upgrade remains street-legal.
  • Professional Installation: If you’re uncomfortable with lifting your vehicle or working with exhaust components, seek professional installation to guarantee optimal results.
  • Maintenance: Inspect your exhaust periodically for rust or damage, especially if you live in areas with harsh winters or salted roads.

Conclusion

Upgrading the exhaust system on your Mitsubishi Lancer GT is a rewarding project that can dramatically improve your car’s performance, sound, and driving enjoyment. By carefully selecting the right exhaust type, preparing your vehicle correctly, and following a step-by-step installation process, you can achieve a professional-quality upgrade at home. Remember to prioritize safety, use quality components, and consider tuning for the best possible outcome.

With the right exhaust system installed, your Lancer GT will not only sound more aggressive but will also breathe better, delivering enhanced throttle response and potentially increased horsepower and torque. Enjoy the improved driving experience and the confident roar that your upgraded exhaust brings to every journey.