The rear can be done with lowering links that are sold by one our forum members, I just installed a rear set back in July. As for the front, I don't know since I only have rear air.

__________________
2002 X5 4.6is
1999 C5 Corvette
1992 Mitsubishi 3000GT VR-4
1994 Kawasaki ZX-9R
2005 Mazda 6 Wagon (Wife's)
1991 Mitsubishi 3000GT VR-4