i dont yet have a turbo but the idea is very simple. the more psi you push, the more power. that means you are going to wear out your engine quicker. if its your daily driver then 6psi is a great idea, if its just a track car, then go nuts.
there are a lot of things pending like tune, other mods, ect. . . . .
but if you cant afford for the car to be out of commission for a while if something gose wrong, than imho you should start off lightly