HMTdmc

I like this noob....Man Like some others said psi doesn't so much matter as the size of the turbo..THink of a turbo like a fan a small one like people put on a desk or something doesn't move alot of air just like a small turbo doesn't move as much air but in it's own little outlet it builds boost at ten psi the little fan/turbo is still moving just a little bit of air.
Now take a big garage fan/turbo it'll blow a small child or 90 pound weakling off his feat. and moves alot of air.

Now you ask yourself well how the ---- does it move way more air but still have the same psi? the answer is veolocity of said air. It's an equation I don't remember it right now but the principle is this.

A small t25 moves a small amount of air at 10 psi in a 2.5" charge pipe. at a slower speed / now a big gt40 turbo at 10psi is really cranking that air out fast its moving air way faster then a t25. So at the same pressure level your getting way more cfm....And an engine is just a big air pump so the more air that passes through it the more hp you make.
then the more fuel your going to need to keep the proper Air/Fuel ratio. So thats when bigger injectors and a 255lph fuel pump come into play.