To retain factory functionality

or high-lift camshafts

clean filtered air routes back in through the engine to be burned and to promote negative crankcase pressure for optimal performance

All pumps use check valves that prevent back-flow

Performance without Compromise

BMW S58 Head Stud Thread Insert Kit S65B47 To retain factory functionalityThe BMW S58 Head Stud Thread Insert Kit provides your machine shop everything needed to repair or upgrade the engine block threads on BMW S58 engines. Designed for precision and durability, this kit allows you to restore damaged threads or prepare the block for oversized head studs for improved clamping strength. Please note, this product does NOT include head studs. Head Studs are available for purchase here. Each BMW S58 Head Stud Thread Insert Kit