Fits Before Catalyst Right Hand Upstream; Sedan/Quad Cab Short Wheelbase; Lt. Duty 4WDor Before Catalyst Right Hand Upstream; Regular Cab; 8 Foot Bed; Lt. Duty 4WDor Before Catalyst Right Hand Upstream; Regular Cab; 6.5 Foot Bed; Lt. Duty 4WDor Before Catalyst Right Hand Upstream; Crew Cab; 6'4" Box; Lt. Duty 4WDor Before Catalyst Right Hand Upstream; Crew Cab; 5'7" Box; Lt. Duty 4WD