Here are the two highest dyno results for a N/A RB30 from the r31 forum.
GTS_143 (NSW)177rwkwRB30DE
(R33 VCT Head) (ported) with stage 2 cams, 12:1 comp, Monster
Extractors, lightened & balanced bottom end, twin 64mm XF TB's, Full
3" Exhaust, Link ECU, CAI & Pod, Twin Thermos.
#2DMN NA (NSW)154.6rwkwRB30DE,
RB26 head, Between 12:1 and 12.5:1 comp, Balanced rods, RB25DE pistons,
RB20DET 270cc injectors, Crank grub screwed, oil restrictors, N1 GT-R
rings, Adaptronic ECU, Hurricane Equal Length extractors, 2.5" mandrel
bent exhaust, 3" stainless cat, hot dog, mega flow rear muffler,
Splitfire Coilpacks, Adjustable cam gears
Both with twin cam heads and much dollars spent.
The claim of 200rwkw with no more than $2000 is a bit rich.