just fyi.....
a guy here on the gold coast, (well brisbane) has a 1uz in his silvia, has had for 3 + years... in n/a form with stock plenum, + extractors + filter + haltech, best he made was 205 RWHP.. he changed to the same 8 itb setup i used on my ae86 and made virtually identical power i made in my ae86, 280 RWHP. This 75 RWHP jump was from the itb setup.....
he has since sold it, reverted to stock plenum and bolted on a nitrous kit, now makes 307 RWHP.....
theres also two mx83 cressidas doing the northern NSW drift rounds, both with 1uz's + w58's, and both have stock inlets and STOCK headers, they make identical power of 180- 185 RWHP..
these are not 'hearsy' figures, but real world numbers....
expecting 150 RWKW from a stock engine simply wont happen, 130 is closer the mark....
good luck anyway, as the torque more than makes up for the lowish RWHP figures...
josh