FTP BMW E8X E9X N54 charge pipe for 135i, 335i, 1MBMW OEM PART NUMBER 13717590304 CHARGE AIR INDUCTION TRACT Features Increased Flow Direct OEM Replacement 3in Mandrel Bent Aluminum Construction 3 Play Silicon Couplers The FTP BMW N54 Charge Pipe both increases flow and improves the reliability of your twin turbo BMW. The 3" mandrel bent aluminum pipe replaces the brittle factory plastic pipe which can fail under increased boost pressure. The increased piping size helps to reduce turbulence and