as PDT says, expect between 235 and 247Hp, which is still a very big increase. its not the power that makes REVO though its the torque, this is what you feel pushing you in your chair and makes the car accelerate. you can expect anywhere from 260Ibft-280Ibft increase,
ignore the figures mate, that is all to gain customers who buy purely off what the tuners websites state.
as a comparison
std GTI- 200Ps/197hp and 207Ibft torque
stage 1 GTI 235-247Hp and 250-280Ibft torque
so irrelevant of what rolling road you use, you will get a huge increase in the performance of the car.
mine is stage 1 and is running 240Hp/270Ibf