Flowmaster Exhaust System Kit

American Thunder Kit
Cat-back 409S 11-12 Mustang
Cat-back System 409S - Dual Rear Exit - American Thunder - Aggressive Sound
Cat-back System 409S - Dual Rear Exit - American Thunder - Aggressive Sound - 2011 to 2012 Ford Mustang GT
Does NOT fit GT500.
Exhaust System Kit
Fits 2011 to 2012 Ford Mustang GT and convertible with a 5.0L engine.
Flowmaster, cat-back, dual rear exit, american thunder, 409S, 817500
For the serious enthusiast who is looking for all the performance benefits of a complete Cat-back dual exhaust system, this is it. As an American Thunder system, it delivers an aggressive exterior sound level and a moderate interior tone that is suited to the enthusiast who wants to be heard. With maximum performance and easy fit in mind, the system is mandrel bent and includes specially engineered mufflers featuring Delta Flow technology. 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 a simple installation.