Joel, as I posted before, mods such as full exhaust, FMIC, boost control to 14psi , fuel pump and piggy back ECU (such as a haltec) will net you ~200 awkw. And this is from an owner of a Legnum, Sil80 with RB26 for circuit sprints & an R32 skyline on ozvr4 when asked about the whether to have an R32 or a legnum: