Don't bother with that, it's a waste of time. It's super cheap to just find another V8 and put that in. Plus why would you want an i6 in a V8 X5? A 4.4 already feels kinda sluggish (IMO).

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2003 X5 4.6 | 2000 540i Touring

Formerly owned:
2004 Range Rover | 2000 M5 | 2000 540i/6
1995 750il | 2003 Mercedes S500 | 2003 540i/6