Mugen - i picked them up from 1010tires.com and had my dealer install them. I put about 9K on the stock Dunlop runflat 20's so my plan was to put them back on before lease end.

I will say that i didn't feel any substantial performance loss in terms of cornerning and general performance. In fairness, I don't push the car very much!

With shipping the damage from 1010tires was around $1050 and installation was $250ish. But I live in NYC and only have one car so the summers weren't an option for the winter.

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2008 X5 - 4.8i silver w/ black
tech, sport + 20"s, and other goodies