aFe Power 49-44064-B LARGE BORE HD 3.5" Stainless Steel DPF-Back Performance Exhaust System In house testing resulted in up to 40% increase in flow Constructed of 3-1/2" mandrel-bent stainless steel tubing Includes a massive 5" Dia. black stainless steel intercooled tip Fits Crew Cab/Short Bed (128.3" Wheelbase) & Crew Cab/Long Bed( 140.5" Wheelbase) 50-State street legal