The Downpipe Kit fits in to the n20 engine:

BMW 125i F20 / F21
BMW 220i F22 / F23
BMW 228i F22 / F23
BMW 320i (x) F30 / F31 / F34
BMW 328i (x) F30 / F31 / F34
BMW 420i F32 / F33
BMW 428i (x) F32 / F33 / F36

Replacement for OEM BMW Part# 18327645666 from year of construction 10/2012+

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
200cpi catalytic converter
connection diameter 105mm