Ok so im wanting to either add an ipod integration kit or bluetooth to my car. I have an 05 grand prix gt with the factory radio. I dont want to lose my stearing wheel controls. i have onstar (not sure if that makes a difference). Im looking for something easy to install like one that you just plug the wiring harness into the interface and then the wiring harness that comes with the interface into the radio. Any help, tips, hints, or advice would be greatly appreciated.