i have an 03 cts luxury sprt model.
it comes with the navigation and i wanted to install the aux cord. i seen the how to on the aux cord but it was the cts without the navigation on it and i kinda figured it would be different?

also where can i find a disc to upgrade the navigation? or can you insert a new disc so it can upgrade? i was thinking of buying a disc fromw one of the newer model cts from the dealer but i didnt know if it was compatible or not?