The Downpipe-Kit fits in to: BMW M135i F20 / F21 till 06/2013 BMW 335i(x) F30 / F31 / F34 till 06/2013 BMW 435i(x) F32 / F33 till 06/2013 Replacement for OEM BMW Part# 18328603875 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 catless* *Off-road use only unless catalyst fitted in exhaust mid-section. Removal of all catalytic converters will almost invariably make your vehicle illegal for use on a public road. ECU will need to be coded to avoid engine management light errors.