I have had this same thought ever since I started using my 520. I was going to start a tree of my own for future use of the functions I use most. Someday....

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2004 X5 4.4 Build 01/04 Alpine White on Schwarz Dakota Leather, Anthracite Headliner
Xtrons Android HU, SPORT PKG, COLD WEATHER PKG(W/REAR HEATED SEATS AND HEATED STEERING WHEEL), CONVENIENCE PKG, FACTORY HITCH