i will go for 275 front and 315 rear...that looks much better and powerfull,and i guess that is what are you looking for...20 inches!!!try style 259 or 214,both are great and more than good looking on x6!
however if you are choosing between 2 alloys,that you have posted,then i will go for darker version.
performance will be drag down,but not as much as you think..maybe 1% he he...you wont feel it at all!!
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