Honestly? I don't think an X5 should be "slammed", and I wouldn't want to do anything to compromize the ride quality, but I do think that decreasing the gap between the tire and the wheel well a bit would look better, especially with the 19's & 20's. I dunno, perhaps about 1.5 to 2" would look great, but I don't like it when people lower their vehicles so much that the top of the tire is hidden by the wheel well...

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'08 335i Coupe - Barbera Red / Saddle Leather / Light Poplar Wood / 6spd Manual
Options: Sport, Premium, Cold Weather, Comfort Access, Active Steering (awesome!), Power Rear Shade, IPod Adapter, Navigation w/IDrive
Mods: M6 Wheels, Split Armrest, M-Steering Wheel, Euro Light Switch w/Rear Fog Lights, Short Shift Knob w/Matching E-Brake Handle, Clear Reflectors, CDV, Clear Bra

Retired:'04 X5 4.4i