I don't think the radio us exclusive to the Exclusive. So, first, take Bluetooth out if the equation. Turn on your bike speakers (audio, sound, speakers on). Verify they are working properly by dialing in a good FM station. Switch to Sirius. Make sure you're not in a garage, and have a clear view if the sky. If signal sound from speakers is bad, call Sirius and have them refresh your signal. If still bad, take it to dealer and have them fix the radio.
If your sound us good thru speakers, but bad on Bluetooth, you have a Bluetooth problem. If so, If you have BMW Comm System, ask the dealer to update the BMW Comm software. There's a thread listing the bulletin number. This update significantly improves the Sat audio sound via Bluetooth.
It's hard to help without more specifics.
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