Flowmaster Exhaust - 1987-1993 Mustang LX & 86GT - Stainless Steel Cat-back Exhaust System 409S - American Thunder - Aggressive Sound For the person who is looking for a complete cat-back dual exhaust system with an aggressive tone. With easy fit in mind, these systems are mandrel bent for maximum performance and include specially selected mufflers. American Thunder? These 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: 1986 FORD MUSTANG GT V8 5 GAS FI 1986 - 1993 FORD MUSTANG LX V8 5 GAS FI Material: Stainless Steel Inlet: 2.50 in Outlet: 2.50 in