Yours is not Sirius-ready.

The "50" only applied to radios manufactured in 2002. Your radio was made in 2000, therefore the "50" is not applicable. It is relatively easy to swap out the radio to one that is Sirius ready. (The X5 uses the same CD radio as the E39, and I helped two E39 folks swap their radios to get Sirius.)

If you upgrade the radio, the surest approach is to get one that was manufactured in 2003 or newer. Then it is a sure thing.

One more thing, you may have one of the Old Gen radios in your car that has the round pin wiring harness. If you do a radio upgrade, you will also need to get a set of BMW adapter cables that convert the round pin plugs to the newer style flat pin plugs on the New Gen radios.

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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