The owners manual comes with the Sirius module. You get 12 presets if you have an in-dash radio. You only get 6 presets if your car has navigation.

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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