The Downpipe Kit fits in to: BMW M135i(x) F20 / F21 model 07/2013 - BMW M235i(x) F22 BMW M2 F87 N55 (not suitable for Competition version) BMW 335i(x) F30 / F31 / F34 model 07/2013 - BMW 435i(x) F32 / F33 model 07/2013 - Replacement for OEM BMW Part# 18328602882 made out of high quality stainless steel 1.4301 (SS304) 100% perfect fit, replace OEM less thermal load on the turbocharger more power by reducing back pressure significantly more torque without catalytic converter connection diameter 118mm *ECU will need to be coded to avoid engine management light errors.