Darkside Developments M57 Performance Valve Springs for BMW M57N & M57N2Darkside Developments Performance Valve Spring Kit for BMW M57 Diesel Engines 30% more valve seat pressure than stock BMW springs Prevents valve float on high boost applications Designed for use with stock and upgraded camshafts with up to 9. 3mm Lift
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Darkside Developments M57 Performance Valve Springs for BMW M57N & M57N2