I've heard it's possiible to change the "brain" on XM to Sirius. Does anyone have any info on this?

 

I've heard this is possible.. Probably a bit expensive though. Check this thread out.. has a pretty detailed DIY. http://www.AudiForums.com/m_802165/tm.htm
I've also heard that XM and Sirius are possibly merging.. So maybe just wait a little and there will be no need to switch??

 

www.navplus.us should have some information you're looking for.