I had my S2 RR'd on friday on DD rollers and i while i was impressed with the power for the spec and fact it was a DIY budget build -
171 bhp and 192ftlbs on a standard 1600 and turbo running OFAB Efi with beige injectors, collins powerchip and double capacity cooler.

It would only hold 12.5psi though- fueling would be fine for more and it peaks at @14.5psi.
Turning the boost up just creates more of a peak but it won't hold it.
I'm only running a bleed valve and -31 would boost controller help or is my T3 turbo just rubbish