The aFe Large Bore-HD flange-back exhaust race system delivers maximum performance and improved fuel usage for the Ford Super Duty with the 6.4L Power Stroke engine. This free flowing exhaust system is constructed out of durable 4" mandrel bent 409 stainless steel and uses bayonet style hangers and band clamps for a clean installation. This system comes complete with all tubing, bayonet hangers, band clamps, thermocouple and pressure tap bungs and is finished off with a high luster polished 304 stainless steel, rolled, slash cut tip. You will be shocked at the performance and mileage improvement you will see from this system. This system requires the use of a controller or programmer.