- Fitting Size: Both inlet and outlet connections are 3/8" SAE sized fittings

Built to Last

Upgrade your BMW’s performance with RK Autowerks Catless Race Downpipes for the F10 M5 and F06 / F12 / F13 M6 equipped with the S63 engine

and maximum advance control

N52 CNC Cylinder Head Porting 1827 - Fitting Size: Both inlet5150 AutoSport 5 Axis CNC Cylinder Head Porting for BMW N52 Engines Please note that price is based on customer providing disassembled, clean core. If you need help sourcing a core, please contact our sales team. Also note that this service includes a 1 2 week turnaround time for service completion, beginning when the 5150 Team receives your head. Investing in cylinder head porting for your high performance BMW engine enhances airflow efficiency for