Flowmaster Axle Back Exhaust "American Thunder" Stainless Steel GT/GT500 2011-2012

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  • Stainless Steel Construction
  • Aggressive Exhaust Tone
  • Two Chamber Mufflers
  • Made In The USA
MSRP $574.95
You save 10%

Flowmaster Stainless Steel "American Thunder" Axle Back Exhaust for 2011-2012 Mustang GTs and Shelby GT500s.

The Ford 5.0-liter engine is back and delivers an incredible 412 Camaro-smokin' horsepower. To match the factory's re-issue of the famous 5.0-liter nameplate, Flowmaster set about re-engineering their American Thunder system to deliver that classic 5.0-liter sound, along with additional fuel mileage and power.

This new Flowmaster American Thunder axle-back kit for the 2011 Ford Mustang features a pair of stainless steel, specially built Classic Two Chamber mufflers that provide a very deep and aggressive sound level, and is suited to the enthusiast who wants a distinctive and powerful exhaust note.

The system is constructed with mandrel bent 3" diameter 409S stainless steel tubing for maximum durability and includes a 4" diameter polished tips with embossed logo that exit through the factory rear valence cutouts. A true bolt-on that includes everything you need to easily install at home in your driveway with basic hand tools. As with all Flowmaster products, they are built in the USA.

Installation Difficulty


Intermediate skill is required for this installation.

Installation Videos

Vehicle Fitment

This product will fit the following Mustang years:

  • 2011
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Will this work on my 2012 gt500??

Asked by: Mike2012
Answered by: rk cjpp
Date published: 2018-08-01

Will this axle back exhaust bolt straight in place of standard axle back on my 2011 gt 5.0l?

Asked by: bugs2011
Answered by: CJPP Dave
Date published: 2016-11-17
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