I have a 2005 Pontiac GTO with the blaupunkt audio system. I was wondering if it can be done and what all i need, or need to do to install a avic D3. looking at the dash i think it will fit. but i cant seem to find a kit for it. Also does the whole car need to be re-wired or is there a wiring harness that will let everything function properly. Any and all help is greatly appreciated. Thanks again.

All you need is a double din dash kit, wiring harness, and an antenna adaptor. You can find all of these on ebay. Just search for GTO dash kit and scroll to the bottom where it has all the store listings. I just put a DD NAV unit in my 2004 GTO.