aFe Power Elite SS-304 Carbon Tip Dual Cat Back Exhaust 13-14 Porsche 911 C2S (991) H6-3.8LaFe is proud to introduce the aFe dual cat back exhaust system. In recent testing this aFe cat back exhaust system produced 34 horsepower and 43 lbs. x ft. of torque, furthermore, weighs 20 lbs. less than the stock exhaust. With the iconic 911 already a well engineered performance driving machine, aFe developed t he perfect balance of pure, race inspired performance while ensuring that perfect sound decibel and exhaust note creates the ultimate