Im about to buy a 2003 Gti 1.8T. But the question in my mind is how much power to expect from the one of them with a stock 1.8T engine with stock turbine and the following mods:

1.Wider turbine inlet pipie
2.down pipe
3.catback
4.bypass blow off(if no check engine issues) else I just get a normal forge which recirculates the air in
5.intake
6.computer reprogramming(the one which has the 3 modes which is vallet, normal fuel and high octane. this one get the max out of the stock turbine, I believe about 19psi)