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One of the most popular upgrades every Mustang enthusiast makes is adding a performance 1999-04 Mustang cat back exhaust. Available from Magnaflow, Flowmaster, Pypes and BBK performance in stainless steel or aluminized steel, these mandrel bent Mustang cat-back systems offer unrestricted flow for improved performance and great american thunder sound. These 1999-04 Mustang cat-back exhaust kits feature high performance mufflers for the aggressive sound you desire.