designed for high-horsepower builds and maximum efficiency

The B-Tube layout increases tube surface area by approximately 15% compared to traditional designs

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

Whether you're working on a one-off build

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B58 Pro-Xtreme Valve & Valve Spring Kit 330xi designed for high-horsepower builds andSimplify 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