The Toyota GR86 (and its Subaru BRZ sibling) is a driver’s car from the factory, but its exhaust note often leaves enthusiasts wanting more. The Megan Racing Cat-Back Exhaust System offers a compelling upgrade: a deeper, more aggressive tone paired with a slight performance bump, all while remaining accessible to DIY installers. This guide covers everything you need to know about the system—from sound characteristics and real-world power gains to a detailed installation walkthrough and maintenance tips.

Why Upgrade the GR86 Exhaust?

The stock exhaust on the GR86 is restricted by sound regulations and cost-saving measures. Even though the FA24 engine delivers strong torque, the factory mufflers muffle the natural boxer rumble. An aftermarket cat-back system improves flow, reduces backpressure, and unleashes a sportier note without being excessive. The Megan Racing Cat-Back specifically targets drivers who want a noticeable change in character without spending exotic sports-car money.

Key Benefits of the Megan Racing Cat-Back

Enhanced Sound Profile

The system produces a deep, rich tone that becomes aggressive under throttle but settles into a mild drone-free hum at cruising speeds. It emphasizes the boxer engine’s unique burble without harsh rasp that plagues some budget alternatives. Inside the cabin, the volume increase is moderate—enough to feel involved without fatigue on long drives.

Measurable Performance Gains

By replacing the restrictive factory mufflers and piping with larger-diameter, mandrel-bent tubing, the Megan Racing exhaust improves exhaust gas flow. Independent dyno tests (often shared on forums like GR86.org) show gains of 8–12 horsepower and 7–10 ft-lbs of torque at the wheels, mostly in the mid-range where the FA24 already feels strong. These numbers are typical for a cat-back system and translate to a livelier throttle response.

Quality Construction

Megan Racing fabricates the system from T304 stainless steel, which resists corrosion and discoloration better than aluminized steel. The piping is mandrel-bent to maintain consistent inner diameter, preventing flow restrictions. Welds are clean and consistent. The included polished stainless exhaust tips (available in 3-inch or 4-inch diameter, depending on the variant) fit the GR86’s rear bumper cutouts neatly.

Direct Bolt-On Installation

One of the system’s biggest selling points is its simplicity. It uses factory hanger locations, slip-fit connections with band clamps, and requires no cutting or welding. Most DIYers can complete the swap in 1–2 hours with basic hand tools. The system is also fully reversible if you ever need to return to stock.

What’s Included in the Box?

  • Cat-back exhaust assembly (mid-pipe + muffler section)
  • 3-inch or 2.5-inch polished stainless steel exhaust tip(s)
  • All necessary gaskets and hardware (band clamps, bolts, nuts)
  • Installation manual (with torque specs)

Compatibility Notes

The Megan Racing Cat-Back is designed specifically for 2022+ Toyota GR86 and Subaru BRZ (ZN8/ZC8 chassis). It does not fit the previous-generation FT86 cars (2012–2020). The system is compatible with both manual and automatic transmissions. If you plan to pair it with an aftermarket header or front pipe, confirm the mating flanges are standard 2.5-inch or 3-inch (depending on your cat-back diameter). Most Megan Racing systems for the GR86 use a 3-inch mid-pipe that reduces to 2.5-inch at the muffler.

Installation Guide – Step by Step

Tools You’ll Need

  • Socket set (10mm, 12mm, 14mm, 17mm sockets)
  • Ratchet and extensions
  • Combination wrenches (12mm, 14mm, 17mm)
  • Floor jack and two jack stands (or a lift)
  • Penetrating oil (WD-40 or PB Blaster)
  • Safety glasses and mechanic’s gloves
  • Torque wrench (optional but recommended)
  • Rubber mallet (for stubborn hangers)
  • Anti-seize compound (for bolts)

Pre-Installation Tips

  • Work on a level surface and ensure the car is securely supported. Never rely on the jack alone.
  • Spray penetrating oil on all exhaust nuts and bolts 15–30 minutes before starting. This prevents rusted fasteners from snapping.
  • If the car has been driven recently, let the exhaust cool completely to avoid burns.
  • Perform the swap on a cold system for best safety and to reduce expansion issues.

Step 1: Raise the Vehicle Safely

Use a floor jack to lift the rear of the car. Place jack stands under the factory lift points on the rear subframe or side pinch welds. Verify stability before sliding under the vehicle.

Step 2: Remove the Factory Cat-Back Exhaust

Locate the two flanges where the mid-pipe meets the front pipe (near the catalytic converter). Using a 14mm socket or wrench, loosen the two nuts on each flange. You may need an extension to reach the bolts from above or below. Next, unbolt the two exhaust hangers (12mm or 14mm bolts) that secure the muffler and mid-pipe to the rubber isolators. Some factory hangers are simply rubber loops that can be pried off with a large flathead screwdriver or a rubber mallet. Once all fasteners are removed, carefully lower the stock system. It may be heavy—have a helper support it or use a jack.

Step 3: Transfer the Hanger Brackets

The Megan Racing system uses the same rubber hanger locations as the factory. If your stock exhaust had separate metal bracket pieces attached to the muffler, you may need to unbolt them and reuse them on the new system. In most cases, the Megan Racing muffler already has welded hanger rods in the correct positions. However, check the mid-pipe hanger; some kits include a clamp-on bracket. Install it onto the mid-pipe at the marked location.

Step 4: Install the Mid-Pipe

Slide the new mid-pipe into place, connecting it to the front pipe flange. Use the supplied gasket between the two flanges. Start the nuts by hand—do not tighten fully yet. Hook the mid-pipe’s hanger rod into the corresponding rubber isolator. Leave the nuts loose enough to adjust alignment.

Step 5: Install the Muffler Section

Connect the muffler to the mid-pipe using the band clamp provided. Do not tighten the clamp all the way; leave it loose for adjustment. Align the muffler hangers with the rubber isolators and push them on. Use a rubber mallet if needed. Position the exhaust tips so they sit centered in the bumper cutouts—spacing of about 1/4 inch from the bumper plastic is ideal.

Step 6: Tighten All Fasteners to Spec

Once the system is loosely assembled and the tips are aligned, tighten the mid-pipe-to-front-pipe nuts to 27–30 ft-lbs. Tighten the band clamp at the mid-pipe-to-muffler joint to 40–50 ft-lbs (or as specified in the manual). Re-tighten any hanger bolts if used. Apply a thin layer of anti-seize to all threads to ease future removal.

Step 7: Double-Check Clearance and Leaks

Start the engine and listen for any exhaust leaks at the flanges and connections. A shop rag placed over the tailpipe can help pressurize the system and reveal hissing sounds. Visually inspect that the exhaust does not contact the subframe, sway bar, or heat shields. Rev the engine to check for rattles. If everything looks good, lower the car to the ground and re-torque the flange nuts (the gasket will compress slightly).

Step 8: Test Drive and Final Inspection

Take a short drive with the windows down. Allow the system to heat cycle, then recheck all bolts after the first 50 miles. The band clamp may need a small re-tightening as the metal settles. Enjoy the new soundtrack.

Sound Characteristics – Deep Dive

The Megan Racing cat-back produces a low, throaty idle with a subtle boxer rumble that becomes more pronounced as you rev. Under light acceleration, the tone is mellow, avoiding the “coffee can” drone that cheap exhausts create. At wide-open throttle above 4,000 rpm, the note hardens into a purposeful roar without being obnoxious. There is almost no interior drone at highway speeds (65–75 mph) thanks to the Helmholtz resonator design on some variants. Cold starts are louder than stock but quiet down within 20 seconds as the idle drops.

If you prefer an even louder setup, the Megan Racing system can be paired with a catless front pipe or aftermarket header. This will dramatically increase volume and add more pops and burbles on deceleration, but may also introduce drone.

Performance Expectations vs. Competitors

Compared to other cat-back options for the GR86 (like FT86 SpeedFactory’s offerings), the Megan Racing system sits at an attractive price point while delivering similar power gains. Brands like Borla, Injen, and HKS offer more refined sound profiles or lighter materials (titanium), but often at double the cost. The Megan Racing exhaust provides the best value for money for enthusiasts who prioritize a sporty sound and reliable gains without breaking the bank.

Maintenance and Longevity

T304 stainless steel resists rust, but the exhaust tips may show water spotting or minor discoloration over time. Clean the tips regularly with a mild metal polish to maintain shine. Check the band clamp and flange bolts at every oil change—vibration can loosen them. The rubber hangers should be inspected for cracking, especially in cold climates. If you drive in winter, consider a light coating of corrosion inhibitor on the welds (though the material is inherently durable).

Frequently Asked Questions

Will this exhaust pass emissions?

Yes—the cat-back system replaces only the muffler and mid-pipe. The catalytic converters and O2 sensors are untouched, so it will pass a tailpipe emissions test as long as your engine is tuned properly.

Does it require a tune?

No tune is necessary for a cat-back system. The ECU can adjust for the improved flow within its fuel trims. However, a tune can extract additional gains if you also modify the intake and header.

Is the system loud enough for track use?

Many track venues have strict decibel limits (typically 95–100 dB). The Megan Racing cat-back measures around 92–95 dB at 3,000 rpm (depending on the variant and whether it’s cold). It may be borderline for noise-sensitive tracks like Laguna Seca (90 dB limit) but acceptable on most.

Can I purchase just the axle-back portion?

Megan Racing sells the system as a complete cat-back only. Axle-back sections are not available separately. If you only want rear muffler replacement, consider other brands.

Where to Buy

The Megan Racing Cat-Back Exhaust for GR86 is available through major retailers such as Megan Racing’s official website, FT86 SpeedFactory, and Redline360. Check for current pricing (typically $400–$550) and availability—stock fluctuates.

Conclusion

Upgrading your GR86 with the Megan Racing Cat-Back Exhaust is one of the most rewarding modifications you can do. It transforms the driving experience with a deep, engaging sound that complements the car’s chassis, provides a mild performance boost, and installs in an afternoon with basic tools. The build quality is solid for the price, and the system will serve you well for years with basic maintenance. Whether you’re a weekend autocrosser or a daily driver looking for more personality, this exhaust checks all the right boxes.

Follow the installation guide carefully, use anti-seize on fasteners, and re-torque after the first heat cycle. Your GR86 will sound the way it should have from the factory—and you’ll have the satisfaction of having done the work yourself.