2010-2012 Mustang Roush kit

2011-2012 Mustang GT Roush Axle Back Exhaust w/ Rear Valance


  • Model: 421155
  • Manufactured by: ROUSH

FREE SHIPPING - Give your car the sound it deserves with the ROUSH 2011-12 Mustang Exhaust Kit with Square Tips and Rear Valance. The innovative open-chambered design of the muffler in this kit doesn't have the fiberglass-packing found in conventional mufflers. The result is a unique sound that isn't held back, and also because of the lack of fiberglass packing, this kit has improved air flow and maximized power. The square tips of this kit fit nicely into the exhaust ports of the ROUSH rear valance which is also included in this kit.

NOTE - Bumper will fit 2010 but exhaust will NOT fit 2010. Exhaust is for 2011+ GT only.

The ROUSH 2011 Mustang Exhaust Kit with Square Tips and Rear Valance will enhance the appearance of your vehicle as well. The tips are made from high-quality 304 stainless steel and are finished with a special chrome flashing process. Conventional chrome plating is comprised of layers of bonded chemicals to achieve its shiny appearance, which are susceptible to cracking and flaking, particularly in hot conditions (such as near exhaust gases). However, the chrome flashing used for this exhaust is bonded micro-porously to the metal surface. As a result, the tips are invulnerable to the normal chrome cracking from localized damage and heat color change. 409 stainless steel is used for the mufflers and inlet pipes for increased durability. This kit is protected by a 3 year limited warranty.
  • Works with 2011 5.0L V8 Mustang
  • Includes ROUSH exhaust and fitting rear valance
  • This value package includes exhaust and rear valance together
  • Provides aggressive sound and increased volume
  • Features the unique ROUSH open-chambered muffler design
  • Improved air flow and decreased back pressure maximizes power
  • Minimized in-cockpit boom
  • 304 stainless steel exhaust tips with special chrome flashing
  • 409 stainless steel pipes and muffler
  • No negative affect on emissions
  • Part #421155

Please Choose:


Add to Cart:

This product was added to our catalog on Friday 03 December, 2010.

Shopping Cart:
now in your cart 0 items
Your cart is empty.


Proud to have warehouses in both the U.S.A. and Canada.
Conveniently ready to ship to both US and Canada locations making shipping faster and more convenient for you.

Connect with Us

Safe and Secure for Online Shopping

MrBodykit.com is the best place to find the lowest prices on performance and show parts for your modern mustang. At MrBodykit.com you can find free shipping on all late model Mustang Parts & Car Accessories excluding large items that require freight shipping. When looking for Mustang Wheels, Tuners, Exhaust, Headlights, Tail lights or any other type of Mustang Performance Parts, don't bother shopping anywhere else - MrBodykit.com will match or beat any advertised price that we carry in stock. Your satisfaction is our top priority.

Ford, Ford Racing, Mustang, Mustang GT, Cobra & Bullitt are registered trademarks of Ford Motor Company. Mrbodykit has no affiliation with Ford Motor Company.

Need help? Call 1-866-610-2376 or 1-250-475-2376 | Phone support or Live Chat during business hours Monday - Friday 8-4 Pacific Standard time.

2002-2013 Mrbodykit.com. All Rights Reserved.