The GT is already a heavy car at around 35xx lbs. To meet 2012 safety regulations, additional bracing will be needed for the platform, plus the addition of side airbags. Additional bracing in the roof, plus the doors will be required, and I would assume the frame itself. It's not going to be hard for them to add 300-400 lbs of weight with all the additional equipment. Once I order my 2010 GT, I'm immediately ditching the rear seat, depending on the weight, the spare tire/jack, and also replacing the hood with a fiberglass variant.