Whether you're working on a one-off build

making them the ideal upgrade for those looking to protect their S54 engine from failure

- Lowers Intake Air Temps (IATs)

genuine Walbro 485 model with E46 NonM specific CNC machined adapter sleeve

B58 Pro-Xtreme Valve & Valve Spring Kit 330xi Whether you're working on aSimplify your next B58 engine build with this all in one Competition Valve & Spring Kit, now available from 5150 AutoSport. Featuring Ferrea's single groove stainless steel valves and a complete high performance valve spring kit, this package eliminates the guessworkgiving engine builders a reliable, track proven solution in a single click. Built for Power. Engineered for RPM. This kit includes standard size Ferrea Competition Plus intake and exhaust