It is not a direct replacement from your original stereo, but it is a cool project. First a couple questions...

Do you have navigation or the standard in-dash radio?
Do you know if you have the standard stereo system (no amp) or the middle "Hi Fi" system (small amp)?

Here is a post about upgrading from the stock HiFi system to DSP.
http://www.xoutpost.com/articles/x5/s...em-dsp-x5.html

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SOLD
2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input