Downpipe designed for: BMW M135i F20 / F21 model 07/2013 BMW M235i F22 BMW 335i (x) F30 / F31 / F34 model 07/2013 BMW 435i (x) F32 / F33 model 07/2013 TurboWorks' downpipe, 100% made made of high-grade stainless steel. Inlet diameter: 119mm (outside flange), 88mm (inside) Outlet diameter: 92mm (outside), 78mm (inside) & nbsp