Or you can just get this system. (Saw it tonight on the Sugar Bowl for the first time):

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Current BMW's:
2011 535xi M Sport TiAg / Black, ZPP, ZP2, ZCV, ZCW, ZDA, 2TB, 6NR, 465, 5DL, and a Partridge in a Pear Tree
2011 X5 35D Deep Sea Blue / Oyster, PP, SP, PSP, CWP, Tech, 20" 214's

Prior BMW's
2008 ///M3 Vert
2008 X5 3.0
2007 X5 3.0
2006 X5 3.0
2006 550iA SP
2003 540iA M-Sport