As much as DSG is a great, i dont think it would be that much of an improvment to justify the very likely LARGE cost of supply and fitting.
plenty of other things available to make your car go faster.
top mounts, TT arms, better lightweight brakes, LSD, forge actuator, hybrid turbo, custom mapping, WMI. All of which would make more of a difference to the car in the bends, and most of them wil make it faster on the strip than what the DSG conversion would.
Of that list for me, it would have to be the diff and the control arms. Diff will make your car put down the power better, thus making it faster, and the control arms and LSD it will make you corner like a house fly with all you other mods.