Below is information direct from Germany regarding this product.
It may show additional information about fitment and specification.
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
without catalytic converter
*ECU will need to be coded to avoid engine management light errors.