M6x40mm (x2)

The Ferrea B38 Valve Spring Kit is engineered to eliminate three of the most common causes of engine failure in performance builds: binding

Inner wheel wells do not need to be modified with tire diameter up to 635mm (215/45R17

Our commitment to minimizing harmonics and optimizing engine performance spans the entire BMW lineup

The E36 driveshaft is made from 3″ x

B46 CNC Cylinder Head Porting 20-0749-FL M6x40mm (x2)5150 AutoSport 5 Axis CNC Cylinder Head Porting for BMW B46 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