Depending on the turbo, but either way a huge improvement over stanard and with the metal head gasket u should be safe around 1.2 to 1.3 bar, maybe more if u have something like splash mode or something.
That’s a very good question, that I'm sure I'll be finding out quite soon. Allegedly the engines are very strong, much like the RB26. From what I've read from other peoples experiences approx 400HP, without touching the bottom end. If you want any sensible power out of the engine, cams will need to go on your shopping list.