Just a question here ,I know we never consider selling our Solstices but in the event you do,why would you want to loose that navigation unit also?I would advise you to keep it and switch it back to stock radio if and when you ever sell it.I am in the process of switching out my factory upgraded stock radio ,it has the 6 cd changer as well as the Monsoon package with Onstar.I believe people want to buy as close to stock as possible when they purchase these cars and then make them their own with specific mods.Just my 2 cents here.
I traded it in for a Sky. They wanted to keep all the after market things I installed because it looked so good. Had I had the forethought of trading it in I would have changed it before I took it but once they saw it as it, they wanted it that way. then I got home and realized I had a radio in the garage I would never use again.