I'll go with this guess. The same thing happen to my wifes 325ci a few weeks ago but no damage to the suspension just damage to the front spoiler and fog light.
Originally Posted by Bruce Heffner
My guess is you ran over blown truck tire debris.
2005 X3 3.0, Mystic Blue Metallic, Sand Beige Leather Interior, Birch Grain Light Wood Trim, Steptronic Transmission, Premium Package, Heated Seats, Privacy Glass, Satellite Radio Prep, Xenon Adaptive Headlights, Heated Steering Wheel, Premium Sound, Power Folding Mirrors and NAVIGATION RETROFIT