well in december i finished up my friends turbo ( 1994 ls) then tuned by jeff (evans tuning ) got it to 215 whp @6400 and 214 lb torque @5400 with 8psi . well now its febuary and he wants a little bit more , but really doesn't have the money to retune. my question is how much more boost would be safe without retuning ? maybe 2-3 psi ?