1988 Chevrolet Pick-up Truck Catalytic Converter CARB Approved C1500 - 5.7L Engine - 3 in. Inner Diameter Inlet X 3 in. Outer Diameter Outlet X 25-1/2 in. Overall Length guaranteed to replace your current 1988 Chevrolet Pick-up Truck Catalytic Converter CARB Approved C1500 - 5.7L Engine - 3 in. Inner Diameter Inlet X 3 in. Outer Diameter Outlet X 25-1/2 in. Overall Length. 1988 Chevrolet Pick-up Truck Catalytic Converter CARB Approved comes new OEM 1988 Chevrolet Pick-up Truck Catalytic Converter CARB Approved aftermarket new 1988 Chevrolet Pick-up Truck Catalytic Converter CARB Approved of remanufactured 1988 Chevrolet Pick-up Truck Catalytic Converter CARB Approved C1500 - 5.7L Engine - 3 in. Inner Diameter Inlet X 3 in. Outer Diameter Outlet X 25-1/2 in. Overall Length.