meth and race gas huh, that means youre whooping on those stock turbos. TONS OF BOOST/TIMING. but lets be realistic, how long will a turbo last if you extract every last bit of power from it. not very.
also, 50hp is ALOT of variance. and dyno to dyno things vary. but remember, traps NEVER LIE. :thumbup
to go from 325whp, to 400-450whp on a stock turbo system, just using downpipes, not cats and an intercooler. im very skeptical. maybe 350-360whp is more realistic from max output in a real world situation.