I slammed mine with some KW coilovers.........Mrbmwx5 and jst2878 (justin) slammed his also....
No problems...though you may need some rear camber plates as there will be some negative camber automatically dialed in once you drop her... I di dnot add them...justin did.......I will burn through my rubber slightly quicker but I enjoy the tad bit more rear neg. camber.....
These pics are from the recent X5 Meet....mine would be the tit silver.....shadow is killing the view but you should get the idea of the drop.....
Rich
RR