you need to call and go visit (with your GT) the good folks at Speedometer Service Company in Roswell - (770) 569 8255 - they are the only atlanta factory authorized Ford radio svc center - they took my GT and added the new XM radio to it and it rocks - The controler comes up between your legs on the drivers seat and sits in the front seat net - They did an awesome job on the install - Good luck with the Mcintosh stuff as each speaker is unique to the GT and they can replace them, under warrenty, for you