Exhaust
2005-2009 Roush Mustang GT/GT500 Exhaust Kit
Roush part # 403936
$799.99
Roush retail price · part only
Installed at our shop
est. $1,099.99
Part $799.99 + about 2 hrs labor at $150/hr ($300.00).
Estimate only — shop supplies and sales tax not included. We confirm the final installed price for your exact vehicle before any work.
Fits: 2005–2009 Mustang
MustangInstalled at our East Bridgewater shop, or shipped anywhere in the US. Prefer to talk? 508-715-3554
- Genuine ROUSH Performance part, from an authorized Gold Dealer
- Installed by Ford specialists at our East Bridgewater shop
- Roush retail price. Installed price estimated up front, confirmed before work
Prices and availability subject to change. Prices updated October 2, 2026.
Details & specs
The 2005-2009 Roush Mustang GT/GT500 Exhaust Kit offers an extreme performance boost to your Ford Mustang. Impress others with its rumble sound while significantly increasing horsepower and torque. This high flow system also has the added benefit of improving fuel efficiency by reducing air resistance. Not only does it create a powerful outside sound, but it also eliminates the typical drone inside the car. Before purchasing, be sure to check your local noise ordinances, as Roush Performance recommends.
Listen to the Roush Extreme Performance Exhaust Kit now:
1-2-3_Inside.mp3 (260 KB
3_Revs_Outside.mp3 (208 KB)
Cruisin_Inside.mp3 (424 KB)
Drive_Away_Outside.mp3 (180 KB)
Drive_By_Outside.mp3 (204 KB)
Startup_Outside.mp3 (170 KB)
Startup_Rev_Inside.mp3 (336 KB)
This Ford Mustang exhaust kit is crafted using a CNC bender, ensuring smooth mandrel bends and a consistent inside diameter throughout the bended area. This results in a significant boost in flow compared to stock/serrated-bent pipes. The kit is constructed with premium 2.5-inch diameter stainless steel tubing and features 4-inch diameter tips made from polished 304 stainless steel, emblazoned with the "Roush" logo. Included with the system are OEM stainless steel exhaust clamps, which provide a secure, leak-proof seal without damaging the pipes during tightening.
The Roush Resonator Off-Road Exhaust Kit fits 2005 - 2009 Mustang GTs and GT500s with factory rear fascia.
Product highlights for the Ford Mustang Exhaust for GT/GT500 (2005-2009):
- Fits 2005-2009 Mustang GT/GT500
- System extends from the catalytic converters-back
- Utilizes 2.5” mandrel-bent piping with a straight-through design that provides added power, increased fuel economy, and aggressive tone
- Can be used in conjunction with the factory GT/GT500 rear valance
- Does not fit the Roush rear bumper
- Includes 4” tips made from polished 304 stainless steel
- Includes all necessary clamps and hardware for installation
- Check local noise ordinance levels for legality
