Freddy, you will have to disable the speed limiter, which kicks in at 205. You know the FGT can really do 212 in stock trim, but is limited to 205. So if you add more power, unless you do something about the limiter, it still won't go above 205. You can get 212 by just removing the limiting function, no extra power needed.
When that 3.3 L Whipple comes out, I'm someone will find a way to remove the limiter. Then what, 240mph? I wouldn't do it myself. The GT sacrifices front downforce in favor of retro looks, and it will tend to lift up, could flip over unless a larger ugly splitter is added to the front end, but that is sacriligious, no?