If you have rear air suspension there are two options. Both should void any warranties.
1. purchase the adjustable rear endlinks that fool the computer and you can lower the rear about two inches. cost about 55.00 dollars shipped
2. If you have a cool bmw dealership they can lower the rear using their computer diagnostics system.cost 1hr. labor at dealership

Make sure you have rear air suspension considering that it didn't come on most 3.0's.
If you dont have rear air suspension than you can do a full KW coilover setup for a 2.5" drop. cost 1950 shipped.

definitely need camber kits for the front and rear from kmac. cost 350 front, 312 rear.

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2001 X5 4.4i WHITE-Loaded like a baby's diaper SOLD