boost is a very beautiful thing, that can fuk u hard if ur not on top of ur game, i would run 8.5-9.5, prob closer to 9flat, but upgrade ur waste gate and put a bigger spring it, we took the 5lb out of a 45mm (??? may have been 35mm, cant remember) and put a 9lb spring (this was in a delsol with b18c1 all stock internals) but it was a big fukn diff, i was very shocked........look into the other aspecs on the turbo subject dont just limit urself to boost, but at the same time boost is great