Upgrading your Subaru Forester with a Trush Performance Exhaust system is a popular modification that enhances both the vehicle’s sound and overall performance. Not only does it provide a sportier exhaust note, but it can also improve engine efficiency by reducing backpressure and optimizing exhaust flow. This comprehensive DIY guide will take you step-by-step through the installation process, enabling you to perform the upgrade at home with confidence, save money on labor costs, and gain valuable mechanical experience.

Why Choose a Trush Performance Exhaust for Your Subaru Forester?

Trush Performance Exhaust systems are engineered specifically for Subaru models, offering a balance of aggressive sound, improved horsepower, and reliable durability. Made from high-quality materials such as stainless steel or aluminized steel, these exhausts resist corrosion and provide a long-lasting upgrade. The design typically features straight-through mufflers and mandrel-bent piping to reduce restrictions and maximize flow, which can lead to modest gains in horsepower and throttle response.

Additionally, the enhanced exhaust note adds a sporty character without being overly loud or obnoxious, making it suitable for daily driving and spirited weekend trips alike. Whether you have a Forester XT turbocharged model or a naturally aspirated Forester, the Trush system offers a tailored fit for optimal performance.

Tools and Materials Needed

  • Socket set and ratchet (commonly 10mm, 12mm, 14mm sizes)
  • Combination wrenches
  • Hydraulic floor jack and jack stands (rated for your vehicle’s weight)
  • Wheel chocks to prevent rolling
  • Exhaust hanger removal tool or large flathead screwdriver
  • Penetrating oil such as WD-40 or PB Blaster
  • Trush Performance Exhaust kit specific to your Forester model
  • Torque wrench for securing bolts to manufacturer specifications
  • Safety gloves to protect your hands from sharp edges and hot components
  • Safety goggles or glasses to shield your eyes from debris
  • Rubber mallet (optional, for gently persuading tight fittings)
  • Anti-seize lubricant for bolts (recommended for reassembly)

Preparation and Safety Precautions

Before starting any work under your vehicle, safety must be your top priority. Follow these preparation steps carefully to create a safe working environment:

  • Select a flat, level surface: Avoid slopes or uneven ground to prevent the vehicle from shifting.
  • Engage the parking brake: This adds an extra layer of security against vehicle movement.
  • Place wheel chocks: Position sturdy chocks behind the rear wheels to prevent rolling.
  • Lift the vehicle: Use a hydraulic floor jack to raise the front of the Forester. Consult your owner’s manual for recommended jacking points to avoid damage.
  • Secure with jack stands: Never rely solely on the jack. Place jack stands under the vehicle’s frame and lower the car onto them for stable support.
  • Wear protective gear: Gloves and safety goggles protect against cuts, burns, and debris.

Once the vehicle is securely elevated, allow the exhaust system to cool completely if you recently drove the car. Exhaust components can remain extremely hot for some time.

Removing the Stock Exhaust System

Careful removal of the existing exhaust is essential to avoid damaging mounting points or other undercarriage components. Follow these steps methodically:

  • Apply penetrating oil: Spray all exhaust bolts, nuts, and hanger mounts generously with penetrating oil. Allow 10-15 minutes for the oil to penetrate rust and corrosion.
  • Start at the rear: Begin by loosening the muffler clamps and bolts. Use your socket set and wrenches to carefully remove these fasteners.
  • Remove exhaust hangers: Using the exhaust hanger removal tool or a flathead screwdriver, pry the rubber hangers off the metal hooks. It may require some force or twisting.
  • Work forward: Detach the intermediate pipes by loosening clamps or unbolting flange connections near the catalytic converter.
  • Support heavier sections: As parts become free, carefully lower them to avoid strain or damage.
  • Inspect components: Take note of any rusted or damaged hardware which may need replacement during reinstallation.

If bolts are severely rusted or stuck, applying additional penetrating oil and giving it more time or using a breaker bar for extra leverage can help. Avoid excessive force to prevent stripping or breaking bolts.

Preparing the New Trush Performance Exhaust for Installation

Before installing, unpack all components from the Trush kit and lay them out in order of assembly. Perform a dry fit by comparing each piece against the corresponding stock part, checking for:

  • Proper length and diameter of pipes
  • Correct orientation of muffler and tips
  • Fitment of mounting brackets and hangers
  • Completeness of clamps, gaskets, and hardware

Confirm that all parts match your Forester’s model year and engine type. Some kits may include different muffler designs or pipe diameters depending on whether you have a turbocharged or naturally aspirated engine.

It’s also a good time to clean any mounting surfaces and apply anti-seize lubricant to bolts and clamps—this will make future removal easier and prevent corrosion.

Step-by-Step Installation of the Trush Performance Exhaust

1. Install the Muffler Section

Begin at the rear of the vehicle by positioning the new muffler in place. Align the muffler’s hanger brackets with the factory rubber hangers on the vehicle’s chassis. Slide the hangers onto the mounting points ensuring a snug fit but allowing some movement for thermal expansion.

Use the supplied clamps to loosely secure the muffler’s inlet pipe to the intermediate pipe or resonator section (if included). Do not fully tighten clamps until the entire system is installed and properly aligned.

2. Connect Intermediate Pipes and Resonators

Next, attach the intermediate pipes that connect the muffler to the catalytic converter or downpipe section. Slide pipes together using the slip-fit connections and secure with clamps provided. Maintain proper alignment to avoid exhaust leaks or contact with suspension and underbody parts.

Take care to route pipes so they do not interfere with brake lines, fuel lines, or heat-sensitive components. If your kit includes resonators, install them in their designated positions to refine exhaust tone and reduce drone.

3. Attach Front Pipes and Downpipe

Depending on your Forester model, the front section may connect directly to the catalytic converter or turbo outlet. Fit these front pipes carefully, ensuring that any gaskets are in place to maintain a proper seal. Tighten flange bolts by hand initially to allow for adjustment.

Verify that all sections of the exhaust system are properly aligned and have adequate clearance from the vehicle frame and suspension. Use a rubber mallet to gently persuade tight connections if needed.

4. Final Tightening and Adjustment

Once all components are loosely fitted and aligned, go back and tighten all clamps and bolts to the manufacturer’s recommended torque specifications. Use a torque wrench where possible to ensure correct tension and to prevent damage to threads or deformation of pipes.

Check the hangers again to ensure the exhaust is well supported and has some flexibility to absorb vibrations without rattling.

Lowering the Vehicle and Initial Testing

After securing the exhaust, carefully remove the jack stands and lower your Subaru Forester to the ground. Before driving, perform the following checks:

  • Visual inspection: Make sure the exhaust is centered, not touching any parts of the undercarriage, and that all clamps and bolts remain tight.
  • Start the engine: Listen closely for any exhaust leaks, unusual noises, or rattling sounds.
  • Check for leaks: If possible, have an assistant rev the engine slightly while you inspect joints and connections for escaping gases or hissing sounds.

If any leaks or rattles are detected, shut off the engine and address them immediately by tightening clamps or repositioning components.

Post-Installation Tips and Maintenance

To ensure your new Trush Performance Exhaust continues to perform optimally, follow these maintenance and care tips:

  • Regularly inspect: Check mounts, clamps, and hangers every few months for corrosion or loosening.
  • Clean exhaust tips: Use a metal polish to maintain a clean appearance and prevent buildup.
  • Monitor sound changes: A sudden increase in noise may indicate a leak or damage.
  • Avoid harsh impacts: Be cautious when driving over speed bumps or rough terrain to prevent hitting or bending the exhaust.
  • Consider re-torqueing: After the first 100-200 miles, re-check clamp and bolt tightness as thermal cycling can cause slight loosening.

With proper installation and care, your Trush Performance Exhaust will enhance your Subaru Forester’s driving experience for years to come.

Frequently Asked Questions (FAQs)

Will installing a Trush Performance Exhaust void my Subaru Forester’s warranty?

Generally, aftermarket exhaust systems like Trush do not void your vehicle’s entire warranty. However, if a warranty claim is related to a component affected by the exhaust system, the manufacturer may deny coverage for that specific issue. Always check your warranty terms and consult with your dealer if unsure.

Can I install the Trush Exhaust myself if I have no prior experience?

While this guide is designed for DIY enthusiasts, some mechanical aptitude and the right tools are necessary. If you feel uncomfortable working under your vehicle or removing exhaust components, it’s advisable to seek professional installation.

Will this exhaust improve fuel economy?

The Trush Performance Exhaust primarily enhances sound and power delivery; any fuel economy gains are typically minimal and depend on driving style and vehicle condition.

Most Trush exhausts are designed to comply with noise regulations in many regions, but laws vary by location. Always verify local emissions and noise laws before installation.

Conclusion

Upgrading your Subaru Forester with a Trush Performance Exhaust is a rewarding project that offers noticeable improvements in sound and performance. By following this detailed DIY guide, you can confidently remove your stock exhaust system and install the Trush kit with precision and care. Remember to prioritize safety, take your time during installation, and perform thorough inspections to ensure a secure fit. Enjoy the enhanced driving experience and the satisfaction of a successful DIY upgrade!