Came across another company that is listing a lowering module for the X5 with the air suspension at all four corners. The company is Intrax suspension and the part number is 20.6.103. I called the dealers that they have listed and neither had any in stock. I called the company was told that it is still in development and won't be available until first quarter next year. If enough of us send e-mails/call about it, maybe, just maybe we can get them to move things along a bit quicker.
The description stated up to a 1" drop and 2" raise.
www.intraxsuspension.com