"Single Flanged 3"" Inlet Pipe. Fits Crew Cab/Short 5.5ft bed only." American Thunder Kit Cat back, exhaust, performance exhaust, exhaust kit Cat-back 409S 04-06 GM 1500 Cat-back System 409S - Dual Rear/Side Exit - American Thunder - Moderate Sound Cat-back System 409S - Dual Rear/Side Exit - American Thunder - Moderate Sound - 2004 to 2006 Chevrolet and GMC 1500 trucks Exhaust System Kit Fits 2004 to 2006 Chevrolet and GMC 1500 trucks with a 4.8L or 5.3L V8 engine, fits Crew Cab with 5.5 foot bed. For the person who wants the look of a traditional dual exhaust system with all the benefits that a Flowmaster Cat-back exhaust system provides. American Thunder DOR/S systems are the perfect choice, and include exit pipes for both dual out rear and dual out side configurations so that you can choose the one that fits your style. American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance 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.
