Originally Posted by ChrisF

With the exception of early '10 cars, all 10-11 GT3's are pre-wired for PDEM's already. There is a pair of pigtails sitting above both "dumb" mounts in my engine bay. For a car that is not pre-wired, you are correct. It would be a huge undertaking; one I wouldn't even consider. For a car that is (most), the retrofit consists of putting in the two mounts and some PIWIS coding to enable them. The programming, as I understand it, is already there.