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Roush Square Tip Axle-Back Exhaust w/ Rear Valance (11-12 GT)

AmericanMuscle no longer carries the Roush Square Tip Axle-Back Exhaust w/ Rear Valance (11-12 GT). Please check out 2010-2014 Mustang Axle-Back Exhaust for an updated selection.
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Features & Details

  • Roush Square Tip Axle-Back Exhaust with Rear Valance
  • Aggressive Roush Styling And Sound
  • Unique Open-Chambered Muffler Design
  • 409 Stainless Steel Tubing
  • 304 Stainless Steel Square Tips with Chrome Flashing
  • Fits 2011-2012 GT Mustangs
Aggressive Styling and Sound. Now you can add the same exact aggressive styling and sound of a special edition Roush Mustang to your very own Pony with this convenient all-in-one package from Roush. This Roush kit includes their Square Tipped Axle-Back Exhaust System and their Rear Lower Valance to transform both the appearance and tone of your 2011-2012 GT Mustang.

Muscle Car Sound. Let your 5.0L Coyote engine howl with a Roush Axle-Back Exhaust. This innovative new Roush exhaust system features a hollow chamber muffler that results in increased air flow, and a unique sound, with no in-cabin "boom" normally found with performance exhaust at cruising speeds.

Roush Rear Valance. Designed for aggressive race inspired styling this is the same valance that was found on 2010-2012 special edition Roush Mustangs. Made in the USA from OEM quality high pressure injection molded high-strength thermal plastic olefin (TPO) for it's long lasting durability, this Roush Rear lower Valance features a satin grained texture for an OEM appearance and to increase longevity against rock impacts from daily driving.

Application. This Roush Axle-Back Exhaust Kit with included Rear Lower Valance is specifically designed for use on all 2011 to 2012 GT Mustangs including coupe and convertible.

Fitment: 2011 2012 Details

MPN# 421155

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Lower Rear Valance
  • (2) Muffler assemblies
  • (2) Square Tips
  • (4) Clamps
Installation Info
Tech Specs
Will it fit my Mustang?

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Questions & Answers (2)

2 Top Rated Questions

Do you have any installation instructions for the new Roush rear valance on how to remove the OEM and putting on new Roush

  • We do have installation instructions for the Roush Square Tip Axle-Back Exhaust w/ Rear Valance (11-12 GT). If you check out the Roush Rear Valance (10-12 GT, V6) item #69048 page, click on the installation instructions on the page or found here in this link (

Helpful (0)

I've been thinking about purchasing these axle backs for a while but there have been some consistent reports of rust issues after mild use (under 5000 miles). To your knowledge has Roush done anything to rectify this defect?

  • There did encounter few occurrences with the Roush Square Tip Axle-Back Exhaust w/ Rear Valance beginning to rust, however, the occurrences have significantly decrease within the past few months. I cannot say for sure if they changed the process of the bumper's or added a coating, as that information is not disclosed, but they do back this kit with a limited 3 year/36,000 mile parts warranty, if it is to begin corroding.

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Customer Reviews (4) Write a Review

Overall Rating 5

out of 5 stars

Installation Time:Afternoon

  • Loudness / Volume 4 4
  • Exhaust Note 4.25 4.3
  • Fit & Finish 4.75 4.8
  • Bang For Your Buck 4.75 4.8

  • 5/5

    Installation Time: Less than 1 Hour

    July 20, 2017


    Love it. Just had to take my whole bumper off even tho they said I didn't need to.


    Year: 2012 Submodel: GT

    Helpful (12)

  • 5/5

    Installation Time: Afternoon

    May 28, 2017

    Love it

    Sound is awesome. Valance didn't come with backup alarm holes. I used a 7/8 hole saw and dremel to make the double D shape. It took longer for this process than installing the exhaust. Ha ha


    Year: 2012 Submodel: GT

    Helpful (12)

  • 5/5

    Installation Time: Afternoon

    March 30, 2016

    Great sound!!!

    Very easy step by step install. All fit perfectly in place and sounds amazing! Pretty loud on a cold start up but mellows out. Very quiet when you want it you can still talk with the person next to you without yelling but everyone will hear you for sure when you get on it! No drone at all on the highway!! Best all around exhaust I've ever used!!!!! I Love it!!!!!!


    Year: 2011 Submodel: GT

    Helpful (13)

  • 5/5

    Installation Time: Afternoon

    March 05, 2016

    Visceral, raw, and down right fun!

    IF you want a unique exhaust that will make you stand out from the local mustang crowd look no further. This Roush system turns heads on the street and the parking lots. very nice rumble although a little subdued for my taste. Has a minuscule drown at 75 but honestly you'll have the radio on and never hear it. This is a must have for the enthusiast who wants that mustang sound for a great price!


    Year: 2011 Submodel: GT

    Helpful (13)

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