If you drive a BMW with an N54, N55, or S55 engine, upgrading your vehicle’s crank hub can be worthwhile. You may have heard about stock crank hubs slipping under higher load, RPMs, or frequent shifting. You can find an N54, N55, and S55 crank hub solution designed to mitigate common concerns of the stock design. But what specifically makes spline lock technology the standout upgrade you should choose?