The Downpipe Kit fits in to the n20 engine:BMW 125i F20 / F21 BMW 220i F22 / F23BMW 228i F22 / F23BMW 320i (x) F30 / F31 / F34 BMW 328i (x) F30 / F31 / F34 BMW 420i F32 / F33 BMW 428i (x) F32 / F33 / F36Replacement 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 OEMless thermal load on the turbochargermore power by reducing back pressuresignificantly more torque200cpi catalytic converter connection diameter 105mm
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