Yes, it is.
For context, my MY08 GT (2.5L) made 208kw on the same dyno with a TD05 20G - so the dyno is not exactly creative.
Just saying that with a careful selections of mods (and E85) some nice power can be made from the twin turbo setup.
Converting to single is not always the answer - I have a VF34 P20 and the other single conversion parts in my shed, but have chosen not to go down this track at present. I wouldn't expect any more power out of the VF34 at any rate.
Is 220kw reliable?
Well the car is driven daily by myself/my wife and has been tuned/running E85 for 6 months now, so I'm comfortable with where its at. Long term - time will tell.
Just thought this might encourage some TT owners to take it a bit further - but don't just go modding willy nilly (that will only end in tears and an empty wallet).