I'm about to make your year:

https://xoutpost.com/bmw-sav-forums/...n-x5-750i.html

Somebody recently put a 750 motor into an X5 and detailed all the differences and how to overcome the issues related.

The best part is it was even 4.8 variety

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)