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.