The Downpipe Kit fits to: BMW 135i E82/E88 BMW 335(x)i E90/E91/E92/E93 made out of high quality stainless steel cast 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 *ECU will need to be coded to avoid engine management light errors.