Might I suggest some X5M wheels and tires???
Click the link for a set for sale!
http://www.xbimmers.com/forums/showthread.php?t=964899
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2014 BMW 650xi Gran Coupe Msport Black Sapphire Metallic on full black merino leather. 20" M5 343M wheels for summer, 20" 373 wheels for winter with Nokian Hakkapeliitta 8 studded snow tires. M6 CP exhaust with M6 Diffuser and ///M Performance carbon fiber finisher. Mission Performance stage 1.5 and transmission tune.