HEY F-BODY FREAKS!!! PLEASE, somebody tell me if you can add a 12 disc changer to a 98 trans am!!!!!! I have a 98 T/A coupe with a monsoon system and I read you cant install the 12 disc CD changer if you have a CD head unit it has to be the cassette head unit with the AUX button on the unit.Is this true?