No combo in sight
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Boo that stinks, BT audio is important to me as well. BT audio for the M3 came out in mid-late 2011. Build dates from September 2010 the combox became available. You can retrofit it if you're willing to pay but it’s damn expensive. You can also get the tune2air, I’ve read that it sounds pretty good.
https://www.amazon.com/Bovee-Bluetoo.../dp/B00R3ABHXY