The Gibson single cat‑back exhaust for 1988–1989 GMC C3500 Sierra 7.4L is designed to improve acceleration, towing and passing power. This stainless system exits near the stock location with a polished slash‑cut tip; dyno testing has shown gains up to 32 horsepower and 60 lb‑ft of torque in some applications. It includes hardware and factory‑style hangers for a hassle‑free bolt‑on installation and a lifetime limited warranty.

Gibson 88-89 GMC C3500 Sierra 7.4L 3in Cat-Back Single Exhaust - Stainless