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A quick and easy way to improve the sound of your 2011+ Mustang is to swap out your Mustang mufflers. We carry all of the most popular brands, including Flowmaster American Thunder, Pypes Violator, SLP Power Flow, Magnaflow power pack Mufflers. These 2011+ Mustang GT and GT500 mufflers will not only make your car sound great but will also free up some horsepower at the same time. Take a look at the all new Varitune mufflers from BBK performance that allow you to custom tune the sound and noise levels and increase horsepower and torque at the same time.