[FRPLG]

I have XM and use the FM transmitter and it seems to work well(I would assume they work similarly in Sirius receivers). Of course sound degradation is inevitable when you're broadcasting like that and the one thing that is actually an issue is when traveling over the span of different radio markets you get interference as your chosen FM channel may pick up a stronger FM signal from and actual broadcasting station. Then you have to switch your broadcast signal and change channels on your stereo. It can be a pain. Getting a new enabled head unit hard wired can be expensive too. I think we were quoted 400+ for the new unit plus harnesses and installation. That was without it getting wired into the steering wheel as we would have wanted too. We have a BMW though so I think it is a little more expensive since the stereos in BMWs are run through an amp standard out of the factory and this would have to be changed with a new head unit.