The Downpipe-Kit fits to: BMW 135i E82/E88 BMW 335(x)i E90/E91/E92/E93 made with 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 No Catalytic Converter* *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.