It probably won't work. The DSP amp expects a full volume, 2-channel, line-level input, and most aftermarket radios would not be able to provide this. The reason is that the volume , balance, fader, bass, and trebble adjustments all occur within the DSP amp, not the radi. Therefore, your radio volume knob would be semi-inoperable, and you would not be able to use the fader at all.

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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