Here is a guide to what's involved if you haven't already checked it out on the home page.
http://www.bmwmotorsports.org/pdf/X5_pdc_retrofit.pdf

There's a fair bit of work involved and if you get the dealer to do it it will be very pricey.

You can check what parts are needed here
http://www.realoem.com/bmw/showparts...09&hg=66&fg=05

I don't know why BMW don't include PDC as standard on the X5 - I couldn't manage without it. I have front and rear PDC but I'm also going to add a (non OEM) infrared backup camera.

Consider also getting a generic PDC system fitted by an auto electrical specialist (most radio/alarm installers do these). This option will no doubt be much cheaper and as the E53 X5 system is audible indication only (there is no visual assistance) it may also be better than the OEM PDC.

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Cheers, Brian

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2001 X5 4.4i Sport
Black Sapphire, Hi Gloss Shadowline, Full Privacy Glass.
Too Cool for Jack Bauer