Gibson 19-22 GMC Sierra 1500 Denali 5.3L 3in/2.5in Cat-Back Dual Split Exhaust - StainlessMade to last the new Chevy Silverado Gibson Exhaust Dual Split Rear Cat Back System is here. For the enthusiast who wants an awesome look and aggressive throaty sound this Dual Split Cat back exhaust is for you. Gibson Exhaust Systems decrease backpressure and produce more torque and increased horsepower. Typical gains average of 18 20 horsepower. 4. 0" Rolled Stainless Tips exit straight out the back. Works with most bumpers, roll pans and trailer