The MRT MaxFlow Cat-Back Exhaust offers a deep, muscular rumble derived from the Mustang’s raw, passion-filled heritage. Constructed with superior precision and quality 409-stainless steel tubing, MRT MaxFlow Cat-Backs provide factory-caliber fit and the best rust and corrosion resistance system on the market. The MRT MaxFlow muffler is constructed out of durable aluminized steel. 3.5-inch exhaust tips with brushed finish are included. The MRT MaxFlow Cat-Back fits any 1999-2004 Mustang with 4.6L engine, excluding 2003-2004 Cobras.