specifically for the N55B30 and S55B30 turbocharged inline-six engines

and valve float are common issues that can lead to severe engine damage

and for builds using an aftermarket throttle body

The venturi jet pump is driven by the feed line instead of the return (M3 has 2 venturi jet pumps)

BMW S50B30 EURO Valve Springs by SuperTech Seat Pressure:105 lbs specifically for the N55B30 andDesigned specifically for the BMW S50B30 EURO engine, Supertech high performance valve springs offer unmatched reliability and efficiency for racing and performance applications. Crafted from a premium Superclean Chrome Silicon Vanadium Steel alloy, these valve springs provide enhanced performance and longevity, especially at high RPMs. This advanced material choice not only ensures remarkable strength but also improves structural memory, allowing for