The latest GT500s look fantastic, and they have done a ton of work to get them to be track cars. I have a 2008 GT500 and put the Whipple Supercharger kit that Ford's SVT team and Whipple worked on together. Came with the 2.9l supercharger, cold air, high flow fuel pump, larger throttle body, programmer, and a custom tune program to flash the ECU. Now it is supposed to be 725hp (haven't put on a dyno) and the difference is greatly noticeable. That said, its now almost dangerous on a track with corners. The original config was almost linear in the acceleration band like what they said about the new one. Now when the boost kicks in there is a big surge in power making it almost impossible to get on the power smoothly coming out of a corner. it may be a Hellcat killer, but its a human killer in the hands of someone that shouldn't be behind the wheel. Glad to hear that Ford was able to tame the boost in this Mustang to make it smooth on a track. I just dont have the ~$100K to drop on one. All in on mine(bought new) and still under $50K