Okay I'll bite! You can NOT change the 6.5" to the 8" screen without doing some major surgery to your vehicle. All wiring, modules, NAV system etc are different. So you would have to install NAV to get the larger screen.

You CAN however install a backup camera and hook it up to the 6.5" screen. You can either purchase the BMW retrofit kit for the camera or install an aftermarket video switcher to do the trick!

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2008 X5 4.8i - Jet Black / Black Nevada Leather / Specs: Every possible factory option