I just weighed my 2012 GT Mustang at the road course this weekend. I run it in TT but it is a full interior car with AC and stereo still in place. It weighed 3704 with me in it and a 1/4 tank of gas. Not to far off the weight of these ST's. I really expected the ST to be lighter than it is considering the GT has twice the motor and is a bigger car.