might be able to work with the RNS-E units after-all (somehow I remember reading about a dealership recoding it or something to make it work). I can't find the thread now though. Anyone know anything about this? I'd like to add XM to my car, but the RNS-E versions seem hard to come by. If the "A" version boxes would work too, that would make it much easier. Thanks in advance for the help.