Flowmaster Outlaw Cat-Back Exhaust SystemThis Flowmaster Outlaw Cat back exhaust system for the 2020 2026 Chevy Silverado and GMC Sierra 2500HD 3500HD trucks with the 6. 6L gas engine, is perfect if you are looking for an aggressive sound level inside and outside of the truck, with all of the performance benefits that you would expect from Flowmaster. Maximum increases of up to 9 hp and 9 lb. ft. over the stock exhaust at the rear wheels. Designed for the Crew Cab, Standard Bed (6. 5 ft.)