The alarm system is standard equipment on the X5 as explained here.

http://www.xoutpost.com/pdf/e70/05c3_...m%20System.pdf

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Porsche 996 Turbo (Ruf 550)
Porsche 993 Cab.
Porsche 997 GT3
Audi A8
BMW X5 4.8 White, Black Napa, Sport, Technology, Premium, Prem. Sound, Cold Weather, Rear Climate, Multi-Contour, Sirius, HD Radio, Running Bds., Bamboo