Flowmaster American Thunder Cat-back Exhaust SystemThis Flowmaster American Thunder cat back exhaust system for the 2019 2026 GM 1500 (new body style) trucks with 5. 3L engine is perfect for the person looking for an aggressive sound level outside the truck, with a moderate interior tone and the performance benefits you would expect from Flowmaster. This emissions legal bolt on system fits all Crew Cab and Double Cab models with 5. 5 and 6. 5 ft long beds with factory dual exhaust option. Features