Sorry to dig up an old thread but I just purchased my 04 GTP in March,2015. I'd like to upgrade to the 5 button. Can I simply just get a 5 button from somewhere with the new dash piece and clip the factory wiring harness to it? (I'll worry about the temp sensor and compass after I know it can be done.) I don't mind having a dealership reprogram the DIC for me,just wondering if it can be done. Thanks.