Introduction: Why Upgrade to the Barra Performance Exhaust on Your Subaru Forester?

The Subaru Forester is celebrated for its versatility, all-wheel-drive capability, and everyday practicality. However, for many owners, the factory exhaust system leaves room for improvement—both in sound and performance. The Barra Performance Exhaust System has become an increasingly popular aftermarket upgrade among Forester enthusiasts, offering a blend of improved exhaust flow, weight savings, and a more aggressive exhaust note. Whether you're looking for a sportier daily driver or building a capable adventure vehicle, replacing the restrictive stock exhaust with a Barra system can transform your driving experience.

This article provides a comprehensive installation guide, a detailed sound comparison between the stock and Barra systems, and answers common questions to help you decide if this upgrade is right for your Subaru Forester. For official product details and application notes, visit the Barra Performance official website.

Benefits of the Barra Performance Exhaust System

Upgrading to a performance exhaust is one of the most cost-effective modifications you can make to your Forester. Here are the key advantages specific to the Barra system:

  • Improved Horsepower and Torque: By reducing backpressure and improving exhaust gas flow, the Barra system frees up naturally aspirated and turbocharged Forester engines, resulting in noticeable gains in mid-range and top-end power. Many users report gains of 5–15 horsepower depending on the engine configuration.
  • Weight Reduction: Factory exhaust components are often heavy, especially the mufflers and resonator. Barra systems use mandrel-bent stainless steel or aluminized tubing, often saving 15–25 lbs compared to the stock system. This reduces unsprung weight and improves throttle response.
  • Enhanced Sound Profile: The Barra system is designed to produce a deep, aggressive tone without excessive drone at highway speeds. Depending on the chosen configuration (cat-back, axle-back, or turbo-back), you can tailor the sound from a mild growl to a full-bodied roar.
  • Durable Construction: Barra uses high-quality T304 stainless steel (or aluminized steel for budget options) with CNC mandrel bends for smooth, consistent airflow. The systems are built to resist corrosion and withstand the rigors of off-road or winter driving.
  • Customizable Options: Whether you want a single-exit or dual-exit tip, polished or black finish, or a resonated or non-resonated mid-pipe, Barra offers multiple configurations to match your style and sound preference.

For a deeper dive into performance testing and dyno charts, check out this Subaru Forester forum thread with real-world user data.

Tools and Materials You'll Need

Before beginning the installation, gather the following tools and supplies. Having everything ready will make the process smoother and safer.

Category Items
Hand Tools Socket set (metric, 10mm, 12mm, 14mm, 17mm), combination wrenches, ratchet, extension bars, torque wrench (capable of 20–50 ft-lbs), screwdrivers (flathead and Phillips)
Specialty Tools Exhaust hanger removal tool (or a long flathead screwdriver and penetrating oil), pry bar or small pick for stubborn rubber hangers, exhaust sealant (optional for slip joints)
Safety Equipment Safety glasses, gloves, jack and jack stands (or ramps), wheel chocks
Supplies Penetrating oil (WD-40, PB Blaster), new exhaust gaskets (if not included with Barra kit), anti-seize compound for hardware, shop rags
Barra Performance Exhaust System Cat-back, axle-back, or turbo-back kit compatible with your Forester year/model. Verify part number on Barra’s vehicle fitment tool.

Step-by-Step Installation Guide

Installing the Barra Performance Exhaust on your Subaru Forester is a moderate DIY job that typically takes 1–3 hours depending on your experience and the condition of your existing hardware. Always work on a level surface and allow the exhaust to cool completely before starting.

Step 1: Prepare Your Vehicle

  • Park the Forester on a flat surface, engage the parking brake, and chock the rear wheels.
  • If using a jack, lift the rear or entire vehicle and place jack stands at the designated lift points. For Forester models, the rear differential or subframe jack points are common—refer to your owner’s manual.
  • Apply penetrating oil to all exhaust bolts and hanger rubbers you’ll be removing. Let it soak for 5–10 minutes while you organize your tools.

Step 2: Remove the Stock Exhaust System

  • Starting at the rear, locate the bolts connecting the axle-back section to the mid-pipe (or the bolts at the rear muffler flange). Use a socket and wrench to loosen and remove them. Note: On many Forester models, the rear muffler is held by two 14mm bolts and two rubber hangers.
  • Use the exhaust hanger removal tool or a flathead screwdriver to pry the rubber hangers off the metal studs. Work carefully—the rubber is tough but can tear if you use too much force. A quick spray of silicone lubricant helps.
  • Support the stock muffler as you remove the last hanger, then lower it to the ground. You may need to tilt it to clear the rear bumper.
  • Next, remove the mid-pipe section. On cat-back systems, this involves loosening the bolts at the catalytic converter flange and disconnecting the mid-pipe hangers. For turbo-back systems, you’ll also need to unbolt the downpipe from the turbocharger. Follow Barra’s specific instructions for your kit.
  • If you encounter seized bolts, use a breaker bar or impact wrench. As a last resort, apply heat with a propane torch (be aware of fuel lines and brake lines). Replace any damaged hardware with the new stainless steel bolts provided in the Barra kit.

Step 3: Install the Barra Performance Exhaust System

  • Before installation, inspect the new Barra parts. Check that all gaskets, clamps, and hardware are present. Lightly lubricate the rubber hanger bushings with soapy water to ease installation.
  • Begin from the front (engine side) and work your way back. If it’s a turbo-back system, install the downpipe first, using a new gasket and torquing the bolts to the manufacturer’s specification (typically 30–40 ft-lbs). Apply anti-seize to the threads.
  • For cat-back systems, connect the mid-pipe to the catalytic converter flange using the supplied gasket. Hand-tighten the bolts, then move to the axle-back section.
  • Position the axle-back (muffler) on the hanger studs. Slide the rubber hangers over the studs—use pliers to stretch the rubber if needed. Ensure the muffler sits level and clears the bumper cutout.
  • Align all slip joints and flanges. Tighten clamps evenly. Do not fully torque at this stage—leave everything slightly loose to allow for adjustment.
  • Once all components are loosely assembled, check clearances around the rear differential, sway bar, and frame rails. Rotate the tips and clamps to achieve even gaps. Then tighten all hardware to the recommended torque (usually 35–50 ft-lbs for flanges and 40–60 ft-lbs for band clamps).

Step 4: Check for Leaks and Fitment

  • Start the engine. Let it idle and listen for any hissing or ticking sounds that indicate a leak at a flange or slip joint. You can also use a gloved hand or a piece of paper near the joints to feel for escaping gas. Caution: Exhaust gases are hot—keep hands away from direct flow.
  • If you detect a leak, tighten the affected clamp or bolt a bit more. For stubborn leaks, exhaust sealant can be applied at slip joints, but it’s best to ensure a proper mechanical seal first.
  • With the engine running, check that the exhaust does not vibrate against the underbody. Listen for rattles or contact, especially around the spare tire well and rear bumper. If clearance is tight, loosen and adjust the hangers or reposition the piping.

Step 5: Lower the Vehicle and Test Drive

  • Once you’re satisfied with the fit and leak-check, remove the jack stands and lower the vehicle.
  • Re-check all bolts and clamps after the exhaust has gone through a heat cycle (drive 10–15 miles, then let it cool). Retighten if necessary.
  • Take a test drive. Listen for drone at cruising RPMs, any new rattles, and enjoy the new sound under acceleration. The Barra system will typically mellow slightly after a few hundred miles as the packing material settles.

Sound Comparison: Stock vs. Barra Performance Exhaust

The sound character of the Barra system is what draws many Forester owners to make the upgrade. Here’s a detailed comparison based on real-world testimonials, decibel readings, and in-cab experience.

Parameter Stock Exhaust Barra Performance Exhaust (Cat-back)
Idle Tone Low, almost imperceptible rumble Noticeably deeper, with a subtle burble
Low-RPM Acceleration (2000–3000 RPM) Muted, refined, no drama Rich, throaty growl without being obnoxious
Mid-Range (3000–5000 RPM) Moderate intake noise, exhaust remains quiet Aggressive, sporty note that builds with RPM; noticeable punch on turbo models
High-RPM (5000+ RPM) Raspy, straining sound Deep and controlled; no tinny rasp
Highway Cruising (60–70 mph) Minimal interior drone Mild drone in some configurations (non-resonated) – use resonated mid-pipe for quiet cruising
Decibel Level (at idle, 3 ft away) ~65 dB ~72–78 dB depending on tip and resonator choice
Interior Noise (cabin, windows up) Very quiet Noticeable but pleasant; no headache-inducing boom

For a direct audio comparison, listen to these sound clips recorded on a 2018 Subaru Forester XT: Stock vs. Barra Cat-back (YouTube).

Factors That Influence Sound

  • Resonator vs. No Resonator: A resonated mid-pipe reduces drone and mellows the overall tone. Non-resonated systems are louder and more aggressive.
  • Tip Size and Design: Larger diameter tips (e.g., 4.5-inch) produce a deeper note, while smaller tips (3-inch) are slightly sharper.
  • Engine Configuration: NA 2.5L engines sound different from turbocharged 2.0L or 2.5L engines. Turbocharged models are louder and more aggressive due to higher exhaust gas velocity.
  • Downpipe Upgrade: Adding a Barra downpipe (turbo-back system) significantly increases volume and high-end power. Be aware that this may affect emissions legality in some states.

Maintenance and Long-Term Care

To keep your Barra exhaust sounding great and lasting for years:

  • Regular Inspections: Check bolts and clamps for tightness every oil change or after spirited driving. Vibration can loosen connections over time.
  • Cleaning: Wash the exhaust tips with soap and water or a dedicated metal polish. Avoid abrasive pads on stainless steel. For heavily soiled systems, use a cleaner designed for exhaust tips.
  • Winter Care: In regions with road salt, thoroughly rinse the underbody after winter drives. Salt accelerates corrosion on any metal, though stainless steel resist rust better than aluminized steel.
  • Re-gasket: If you ever remove the system (e.g., for transmission work), replace the gaskets to avoid leaks.

Frequently Asked Questions

Most cat-back systems are legal in all 50 states as they do not modify emissions equipment. However, downpipe or turbo-back systems that delete or replace the catalytic converter may not pass inspections in California or other strict CARB states. Check local laws before purchasing.

Will it void my warranty?

Warranty cannot be voided solely by using an aftermarket part, but the dealer may deny coverage if a failure is directly caused by the modification. The Magnuson-Moss Warranty Act protects consumers. If you are concerned, keep your stock exhaust and reinstall it before dealer visits.

Can I install this myself, or should I hire a shop?

If you have basic mechanical skills and a set of tools, this is a weekend DIY project. Most owners complete it in 2 hours. However, if you live in the Rust Belt and your stock bolts are heavily corroded, paying a shop (1–1.5 hours labor) may save frustration.

Does the Barra system fit all Subaru Forester years?

No. Barra makes separate kits for different generations: SH (2009–2013), SJ (2014–2018), and SK (2019–present). Always use the vehicle fitment tool on Barra’s website to confirm compatibility. Some kits also vary for naturally aspirated vs. XT turbo models.

Conclusion: Is the Barra Performance Exhaust Right for Your Forester?

Upgrading to a Barra Performance Exhaust System on your Subaru Forester is one of the best modifications you can make if you value a sportier driving experience. The immediate improvement in throttle response, a throatier exhaust note, and the subtle power gains make every commute feel more engaging. Coupled with weight savings and high-quality construction, the Barra system offers excellent value for the enthusiast who wants to personalize their Forester.

Whether you choose a subtle cat-back with a resonated mid-pipe for a refined upgrade, or a full turbo-back system for maximum performance and sound, Barra provides options to suit your tastes. Follow this installation guide, take the time to torque everything correctly, and enjoy years of exhilarating drives.

For more detailed fitment information and to browse available configurations, visit Barra Performance – Subaru Forester Exhaust Systems.