EXHAUSTKIT36 Sports Exhaust + X-Pipe Design 200 Cell Sports Cats + Equal Length Headers Package. DesignTek sports exhaust system gives smooth Bhp & Torque. Made from high quality 14-16 gauge T304 stainless steel, hydro-formed muffler cases, radiuses stressed relieved with 2000 degree ceramic fiber and stainless steel wool packed free flow mufflers. DesignTek X-pipe sports racing catalytic converters give a HORSEPOWER and TORQUE gain to all 997 cars. High Quality T304 SS C.N.C. mandrel bent tubing for maximum exhaust flow. The Equal length headers reduced backpressure and less restriction.