EVO III in stock 91 GS turbo

[scheides]

Yes, you should see a little more power at stock boost levels. That turbo flows more air per psi than the smaller stock 14b. It will really shine compared to a 14b when you crank up the boost to 20 psi or so. Not sure what your other mods are, but you could get away with the old 2G MAS/550cc injector hack to run that setup. Probably best to pick up a SAFC none-the-less if you do that.