i bet ford will keep it around 400hp for a while. Because a lot of people buy mustangs because its an all around good car thats fun to drive. ford doesn't build a car just for drag racers. i mean my mom has an 06 GT and she loves it the way it is. I'm assuming every couple years ford will increase the HP a little bit and fine tune it just like the 05-09's until they redesign it again. And then eventually adding turbos or supercharger to the GT and smaller displacement for better MPG's and the same HP. And then the GT500 will most likely stay around 550 hp. But thats just my guess. I would like to see them come out with an SVT cobra again that doesn't have shelby's name on it.