seriously dont get a plenum, stock plenums aren't bad at all.
Get a bosch 040 pump, ive heard nothing but great feedback about jeff, an rb20 remap will cost next to nothing in comparison to an aftermarket ecu, which isn't totally necessary as a REMAP is probably better anyways. I'd expect once you get a remap and a pump, assuming your motor is healthy id say a ball park figure of 190odd-200 on 1 bar.