1990 GMC Pick-up Truck Catalytic Converter CARB Approved K2500 - 5.7L Eng. - To 8500 lbs. GVW - 3 in. Inner Diameter Inlet X 3 in. Outer Diameter Outlet X 25-1/2 in. Overall Length guaranteed to replace your current 1990 GMC Pick-up Truck Catalytic Converter CARB Approved K2500 - 5.7L Eng. - To 8500 lbs. GVW - 3 in. Inner Diameter Inlet X 3 in. Outer Diameter Outlet X 25-1/2 in. Overall Length. 1990 GMC Pick-up Truck Catalytic Converter CARB Approved comes new OEM 1990 GMC Pick-up Truck Catalytic Converter CARB Approved aftermarket new 1990 GMC Pick-up Truck Catalytic Converter CARB Approved of remanufactured 1990 GMC Pick-up Truck Catalytic Converter CARB Approved K2500 - 5.7L Eng. - To 8500 lbs. GVW - 3 in. Inner Diameter Inlet X 3 in. Outer Diameter Outlet X 25-1/2 in. Overall Length.