Once again, I have received good advise, and suggestions.  This is what I love about you all!  I have XM radio in my Equinox and I love it.  But I like to drive my Corvette on those long runs once in a while.  Having to deal with a single CD changer - getting the CD out of the case, putting it in the player, etc. is a hasel to me.  BUT, my factory radio does not have any input for auxillary so I'd have to have one installed.  Last time I pulled my console apart it took me too long and I don't want to do it again.  So, I'll stick with listening to a CD when I can get one in the player, or a radio station when I can get a signal.  There's always the rumble of my Vette too!!!  

now the rest of the story comes out. there is one option that wasn't mentioned.  i was under the impression that you had an input for the radio but now that i know you don't here is another way to get around that. look for a unit that has a fm transmitter built in. all you would have to do then would be to tune your fm to a certain station and it would come thru your existing stereo. no fuss no muss. i believe that if you go to sirrius or xm store they should have a unit with it or check you favorite store.