In short:

Remove your current 4.4 X5 from driveway.

Clean driveway.

Install replacement 4.6 X5 into driveway. Torque to 44ft lbs.


In all seriousness, at least pistons, cams, and transmission upgrades; not even considering any exterior modifications to look the part.

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2006 e53 4.8is Imola / Cremebeige
2005 e53 3.0 Black / Truffle - AT, Sport, Premium, ZCW
2001 e39 M5 Black / Caramel - Extended Leather, Premium Audio