Being as blunt and fair as possible. A stupid question gets a stupid answer.
Why dont you stop being lazy and go slap it on a dyno? Custom turbo you say. Last time i checked there were a vast selection of turbos that could be strapped to a 25 giving a whole range of different power figures. If you were to com and say you have a 25 with garrett gtxxx running over 9000psi then we could help you. But your question is vague and has too many variables.
Once again go and do a dyno run, then you tell us what you got!