These new radio installs are great and just what I have been looking for. I could not find a cell phone interface unit that is talked about in our manuals, so the next best thing is an after-market unit. I have been pouring over the wiring diagrams of the radio and amp trying to make sure that when I do this i don't mess something else up. I did notice that there is a wire from the radio to the Data Link Connector (05 SRT Manual pg 8A-19). It makes me wonder what else is there that may be needed. It appears that there a speed sensor feeding the radio. But I do not understand if the radio/amp is feeding any Electronic Control Modules that may give the system a warning of some kind. I love these cars, but they are a lot smarter than I am.