Just to add to this..
I have Revo stage 1 on a standard GTi and mine made 231bhp on the rollers, a little lower than I was expecting if I'm honest. I'm very happy with how the car drives, and 30bhp extra over standard is enough to keep me happy so I'm not bothered. The point I'm making is that sometimes expectations get a bit beyond what's realistic. This probably isn't helped by the over optimistic gains quoted by the tuning companies themselves.
Also, for some reason, probably due to the smaller turbo in the standard GTi, we don't see the gains that the ED30 boys see with their K04 turbos. I reckon, on a standard GTi all you can realistically expect from a remap on it's own is around a 30bhp gain..