just different. the turbo will push you back in your seat and have massive mid range, the gt will rocket off the line, but not progressively accelerate harder and harder... the f6 will be quicker ON THE STREET. maybe not the track though. the gt will be hard to get traction down off the line as its making high power from the get go, the f6 will progressively make more as the turbo spools, but when its at its peak you are already moving pretty fast so less chance of wheel spin= quicker car. having said that on the road a tuned f6 will still spin the treads when its on boost anyway... so many people have gone from fast v8's to turbo 6's and got addicted. the progressive push in the seat harder and harder is hard to beat...