Porsche Carrera 991 12-15 Center Muffler Bypass X-Pipe +16 HP +14 Ft-Pds TorqueLooking for a fairly inexpensive way to add 16 Horsepower and 14 Ft Lbs. of Torque (@ 6000 RPM) to your already high performance Porsche 991. 1 Carrera 2012 2015? Well, you've come to the right place. Here's the deal: Fits all 991 Carrera Vehicles 2012 2015 Saves 7. 45 lbs. 3. 3 kg. Direct replacement for the OEM primary muffler with valves. Bolts to stock or aftermarket side mufflers for an improved exhaust tone. High quality 14 16 gauge C. N. C.