Flowmaster American Thunder Cat-Back Exhaust System - 3 in Diameter - Dual Side Exit - 3 in Polished Tips - GM Fullsize Truck 1999-2006 ANT-SPRING High Lift/Large Chamber versions feature

High Lift/Large Chamber versions feature a new raised roof combustion chamber design that is CNC machined for high lift cams and is perfect for reducing compression in supercharger applications or on low octane fuel

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the capacity for power in the JBA exhaust systems gives JBA the extra edge

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Flowmaster American Thunder Cat-Back Exhaust System - 3 in Diameter - Dual Side Exit - 3 in Polished Tips - GM Fullsize Truck 1999-2006 ANT-SPRING High Lift/Large Chamber versions featureFor 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