Flowmaster Exhaust 2005-2010 Mustang GT - Cat-back Exhaust Kit - American Thunder Kit - Moderate Sound These aggressive sounding systems are designed to replace original rear mounted mufflers located behind the rear axle using factory style connections. With easy fit in mind, these systems are mandrel bent for maximum performance and include specially selected mufflers. American Thunder? systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their perfomance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation. Fits: 2008 - 2009 FORD MUSTANG BULLITT V8 4.6 GAS FI 2005 - 2009 FORD MUSTANG GT V8 4.6 GAS FI 2007 - 2008 FORD MUSTANG SHELBY GT V8 4.6 GAS FI 2007 - 2009 FORD MUSTANG SHELBY GT500 V8 5.4 GAS FI 2008 - 2009 FORD MUSTANG SHELBY GT500KR V8 5.4 GAS FI Material: Aluminized Steel Inlet: 2.50 in Outlet: 2.50 in