Tomorrow I pick up my X5 and supposed to have both the iPod issue and the DVD rear entertainment fixed.. IF SO, I will be sure to post what those fixes are, so you can talk to your SA's.

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BMW - X5 4.8i w/all US options packages, 19" Y wheels, White/Tobacco, Huper Optik 50% tint
Mercedes Benz - E320 CDI Park Assist, NAV, Folding Mirrors, Premium Sound, Voice Command, Sunroof, Auto Rear Shade, Bi-Xenon