
Exhaust
2005-2010 Roush Mustang GT/GT500 Exhaust Kit
Roush part # 421915
$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: 2005–2010 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 Roush Performance Axle-Back Exhaust Kit is expertly engineered to provide optimal performance and enhance the growl of your 2005-2010 Mustang GT (4.6L V8) and 2007-2010 GT500 (5.4L V8) with a more aggressive tone. Constructed with 409 aluminized stainless steel piping and featuring a mandrel-bent design, this exhaust offers durability and consistent flow. The system is completed with 2 4" 304 stainless steel chrome-flashed tips, marked with the Roush logo, for a polished look and maximum resistance to rust. Its nonrestrictive straight-through design produces a deep, powerful sound unique to Roush. Moreover, it is engineered according to the original manufacturer's CAD data for a seamless fit and easy installation. All necessary hardware and instructions are included.
Product highlights for the 2005-2010 Mustang GT/GT500 ROUSH Extreme Exhaust:
- Fits 2005-2010 Mustang GT (4.6L V8) & 2007-2010 Mustang GT500 (5.4L V8)
- Roush Extreme Axle-Back Exhaust System
- Designed for improved performance
- Straight-through resonator design provides very aggressive tone
- Piping is 2.5” in size and is made from mandrel-bent 409 aluminized stainless steel for consistent flow
- Tips are 4” in size and are constructed of chrome-flashed 304 aluminized stainless steel
- Utilizes OEM hangars and mounting points for easy installation
- Requires no cutting or welding
- Compatible with the factory Ford bumper ONLY
- Does not fit the Roush rear bumper
- Includes all necessary hardware and instructions
- Backed by Roush Limited Warranty
- Part #421915




