i've looked into both the rb25 and vg30 turbos as a cheap upgrade for my rb20det, what figures i seem to get as to rwkws is around the 180-190 for the rb25 (14psi) and 200-210 for the vg30 (14psi) these figures are with the following other mods, good fmic, full turbo back 3" exhaust, POD, remapped ECU or piggy back system (safc), maybe upgrade the fuel pump to...the good thing is these turbos on the rb20 can run 14psi of boost all the time, set 14psi as low boost and 16-(18psi on the vg30) for high boost and your laughing...pulls all the way to the red line too...anything above these power levels and your going to need to look for larger injectors but now i'm going too far...