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Roush Performance Products 421127 Axle-Back Exhaust Kit, 1 Pack

4.6 (3) Write Review
Free shipping on orders over $29.99

$749.99

$ 99 .00 $99.00

In Stock

About this item

  • Fits 2011-2014 Mustang GT 5.0L V8 & 2011-2012 GT500 5.4L V8
  • Upgraded aggressive sound tone and volume
  • Provides higher air flow and less back pressure for increased horsepower and torque


The ROUSH Axle-Back Mustang Exhaust Kit with Round Tips, designed to fit the 2011-2014 Mustang GT & 2011-2012 Mustang GT500, is an innovative exhaust system from ROUSH that features an open-chambered designed muffler (as opposed to conventional fiberglass-packing). The result is an aggressive sound that is unique to ROUSH, increased longevity (with no fiberglass packing), and increased horsepower & with additional airflow. Another added benefit of this system is the lack of the in-cockpit boom normally found with performance exhaust systems at cruising speeds.


Robert Boeve
2025-09-01 10:01:35
This is absolutely hands down the best sounding Axle-Back exhaust system available for a Mustang. Then again, it’s Roush!! It is what I would expect.
Kevin C.
2025-08-26 11:35:14
Seems to be a lot louder than in their video. Look good, and the Shelby is putting out 620 Hp, without much effort.
David S.
2025-07-29 16:27:04
Love the sound