Not sure about whether or not it's possible, but make sure you actually want it before going to the trouble/expense. When I traded my wife's '06 530iT with auto tailgate option for an '08 X5 she requested that we *not* get that option on her X.

She said she got tired of waiting for the tailgate to self-lift which take about twice as long as it does for you to simply open it yourself......which is especially inconvenient when waiting for the tailgate to open in a downpour with a cart full of grocery bags.

It's one more thing to break and IMO completely unnecessary.

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2008 X5 3.0si Alpine White/Tobacco | Premium | Sport | Technology | Sound | Cold Weather
2006 M3 | Silver Gray Metallic | Black | 6Mt
2009 Porsche Carrera 997.2 C2 | White | Stone Gray | PDK