how much power can stock a h22 motor make

I used an extreme # to make a point. It can be read as the motor can handle large amount of power or more than one could want. That’s a lot of assumptions for one and a lot of retards would take it as fact.

Wouldn’t tune, turbo, supporting mods, etc… all have an affect on HP/PSI ratio?

Sure given the setup which you didn’t mention. The 3/S motor (God, I forgot the code) has made anywhere from 300AWHP-650AWHP+ at at 1BAR. Big difference.