I think Rich has the adjustable air suspension front and back with an intrax module allowing him to go lower than then BMW stock system. Your set up is going to need to be like MrBMW. Front Springs and endlinks. Or you can have the dealer reset the rear height as I am sure you have rear air.

I am currently collecting all the items I need to lower my X.

Have:
B&G front springs $215 (ebay)
custom end links from forum member $60 or $70 cant remember
Dinan Camber Plates $190 ebay

Need:
Front Struts $230 each
Rear shocks ??

Indy install with 4 wheel alignment $750

So I figure around $1500 give take a few Hundo's

Cheaper if you tackle yourself

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2002 X5 4.6 Sold
Dinan CAI, TB, Mass Air, Stage 4 engine & tranny software, X-pipe
2004 745Li
1997 Ford Mustang Cobra Vert
1985 Mazda RX-7
13B-REW single turbo 60-1, Haltech, Meth injection, MSD Ignition, and much more
2008 Mazda Speed3 Hypertech Tune