turbo questions....

i was wondering how much boost a vr-4 can handle on stock internals, also how much the new evo 8's can handle or even push out of that factory turbo, how much boost can a supra push factory???

On the stock turbos - with a boost contoller you can safely go to 15psi (insted of the factory 12psi). If you upgrade your fuel system, you can go several more depending on your injectors etc.

I do not know the numbers for the other cars.

Theres quite a few people running 6-700hp on stock internals so you wont have to touch the internals really. I heard the evo 8s knock on even stock boost on 92 octane.