Flowmaster American Thunder Catback Exhaust GM Truck 99-05 GM Truck 4.8/5.3L
The classic sound of a Flowmaster chambered exhaust, our American Thunder Series features mufflers tuned to deliver more power, torque, throttle response and mileage. Best of all, these exhaust systems take sedate vehicles and deliver that great performance tone especially designed for muscle car and truck fans. American Thunder is the most authentic Flowmaster muffler sound we offer. 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.
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