Genuine BMW timing chain with integrated tensioner rail for the N63/S63 4.4L V8. Over time timing chains stretch and rattle, and while BMW classifies the chain as a lifetime component, many owners proactively replace it during other timing-service work to eliminate chain noise and prevent skipped timing. This kit replaces the chain itself along with its tensioner rail as a matched set.

Fitment: BMW N63/S63 4.4L V8 models - E70 X5, E71 X6, F01/F02 750i/750Li (incl. Alpina B7), F07/F10 550i, F12/F13 650i (confirm exact chain/kit scope at checkout).