Well Dude,
Perhaps the best car to compare with if you cannot get stats for the Superchip GTI is a standard ED30. The ED30 has been shown to produce over 240bhp as standard and so a remapped standard GTI would probably give similar performance stats (if not slightly better!).
You also need to check out the difference between DSG and manual.
I know that I have given several comparisons for performances of most of the hot hatches on another thread on this section, It is a while back, so you will have to do a bit of searching to find it.
By the way, my standard ED30 gives 0-60mph in 5.66 secs and a standing quarter of 14.32 at 98.27mph. I would expect at least those figures from a remappped standard GTI, whether DSG or manual.
Manual standard GTI is 0-60 mph in 6 seconds, although how violently they hammered the clutch to get that figure was the subject of another thread again (violent upshifts!!)
Hope this helps.
BTW the only way to be sure is to get the figures yourself with your own car