Take a look at the top right button on your MID (radio). If it says DSP then you have it.
See here also http://www.xoutpost.com/articles/x5/...ve-dsp-x5.html
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[Sold] 2004 X5 4.4i - Sterling Gray - Truffle Brown, Sport, Preminum, Rear Climate, DSP, Sirius, PDC, 132's (19 inch wheel), Comfort Seats
Dynavin, JL Audio Stealthbox, Alpine PDX-5 Amp
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