- Lowers Intake Air Temps (IATs)

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steel stone guards are available separately

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

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

B58 Pro-Xtreme Valve & Valve Spring Kit 330xi - Lowers Intake Air TempsSimplify 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