Porsche 991 S / 991 C4S Center X-Pipe with Sound Valves "Muffler Delete" Porsche 991 S / 991 C4S Center X-Pipe with Sound Valves 12-16 Description Porsche 991 S / 991 C4S Center X-Pipe with Sound Valves "Muffler Delete"   Fitment 2012-2016 Porsche 991 Carrera S / 4S 3.8L All Models  Center X-Pipe Muffler Delete for PSE Equipped Cars How its designed....The exhaust flow from the headers enter a 2.75" pipe that leads to resonators and converts to a 2.5" pipe at the X-Pipe , the X-Pipe is a true X-pipe , the left pipe and right pipe join together and the X is created with openings between both pipes . The Valves we use are vacuum actuated and of very high quality, we also use High Quality SS-304 thick 14 gauge Stainless Steel to eliminate possibilities of cabin drone. This pipe should easily increase HP to 10HP+ . Click images to enlarge Pictures sell! Auctiva offers Free Image Hosting and Editing.250+ Listing Templates! Auctiva gets you noticed! The complete eCRATER Selling Solution. Track Page Views WithAuctiva's FREE Counter