MON – FRI
7 am – 5 pm PST
SAT – SUN
Note 1: Extended cab with a short bed only.
For the person who wants the aggressive look of a NASCAR race truck along with all the benefits that a Flowmaster Cat-back exhaust system provides. D.O.S.S. (Dual out same side) systems are the perfect choice. 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.
Moderate to Aggressive Sound Exterior Exhaust Tone
Includes hangers and hardware for easy installation
Dyno tuned for maximum performance
Mandrel bent 16 Gauge Tubing
Fits 1999 to 2006 Chevrolet and GMC 1/2 Ton truck with a 4.8L or 5.3L engine, fits 2 and 4 wheel drive models with Extended Cab and short bed configuration on a 143.5 inch wheelbase.
Flowmaster has its roots in solving the engine noise problems encountered by California racers in the 1980s. In 1983 Flowmaster’s founder, Ray Flugger, created his first patented design of racing silencers, which dampened noise with minimal loss of power. Ray attached handles to ease carrying the square shaped race mufflers through the race pits, and the mufflers became known as the "suitcase mufflers." Today, the innovative Flowmaster mufflers are the result of years of development with top race engine builders, thousands of hours of dyno research and "real-world" on-track testing.