Below is information direct from Germany regarding this product.
It may show additional information about fitment and specification.
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
connection diameter 105mm
*ECU will need to be coded to avoid engine management light errors.