MMX BMW S55 Crank Hub Kit (M2 Comp/M3/M4)MMX BMW S55 Crank Hub Kit is an essential modification for the S55 engine. It's no secret that the S55 is prone to spinning its crank hub resulting in quite a hefty repair bill. Once the crank hub spins, the engine's timing is completely thrown off resulting in pistons hitting the valves and complete engine failure. Investing in preventative maintenance could make all the difference! As a preventative measure, MMX have developed this crank hub upgrade
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