I haven't used the 2001 yet but the xdrive is amazing on the newer ones. I have had one front tire and one back tire off the ground at the same time and all it did was pause about 1 second like it was "think" then it went on without spinning. I just hope the non xdrive can do that too.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install