Is it possible to replace a factory single cd player with a factory multi cd player in a 2003 CTS? The dealer says no but I was wondering if anyone has tried to?

Is it possible to replace a factory single cd player with a factory multi cd player in a 2003 CTS? The dealer says no but I was wondering if anyone has tried to?

I have been interested in the same thing.

The radios I have been looking at all have the single disk in them and I have the 6 disk now. I want to upgrade mine because of adding my Ipod to the radio and don't like using the FM transmittor anymore. This would be good to know if I get to change mine out...