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A quick and easy way to improve the sound of your 1999-04 Mustang is to swap out your Mustang mufflers. Most 1999-04 Mustang exhaust systems require offset inlet, offset outlet mufflers (Exc. Cobra models with IRS). 1999-04 Mustang uses 2-1/4” diameter. We carry all of the most popular brands, including Flowmaster, Pypes Violator, SLP Power Flow, Magnaflow Mufflers and the all new BBK Varitune Muffler that can be tuned to the sound that you want. These 1999-04 Mustang mufflers will not only make your car sound great but will also free up some horsepower at the same time.