Not muchbuddy of mine just sold his GSX, it was about 23 PSI and was like 400+ wheel without a tune on 94... set up for 600+ wheel and like 35 psi. on race fuelOther buddy has a 430whp evo 8 (conservative tune) running 25 psi on 94.3ugene wrote: question is: How much boost would he need to pull 350-375 to the wheels.