Ok I had a 4.4 with Scorpions(for snow) and my 4.8 has stock 19" wheels/rubber. the stopping is not even close but the get up and go is just as good. The new Xdrive rocks compared to the previous e53 systems. BUT.... I believe 100% in winter setups so i will have a winter setup next year but you will be very happy with the new xDrive

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2012 X5 50i ZAP(2VA, 336, 465), ZTP, ZPP, ZPS(6VC), ZCW, ZRC, 322, 4UB, 4NC, 610
2011 ///M3 Silverstone II
2011 X5 50i(lemon)
-- SOLD --
08 550 Msport
07 X5 4.8I sport
04 545i sport
02 4.4i sport
01 540I M/sport
00 SL500
97 SL500