In the X5, the DSP, nav computer, CD changer & phone module are all in the compartment on the left side. The radio module is next to the battery.

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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