VORTECH S/C making big Hp on V8s

[BiGANG]

i had a bit of a look on the vortech website, the kit with the water/air cooler runs at 8-9 psi. would more boost be possible on standard internals for a b series motor? Or would that be about the limit of what the standard internals can hold. And would wheelspin be as evident as on a turbo kit with something like this? Im just thinking if more boost is possible because the americans run poorer quality fuel to us and that the kit is designed to run on american fuel.