I personally think GT specs are perfect, except for the Evora. It runs at 480, it'll be even against the others on the tires, but it'll be 3-5 tenths faster. If it runs at 460-70, it'll be 2 tenths faster while getting more tire life. If it runs at 450, it gets 5 laps better tire life. Looks like weight will be the deciding factor in this car.