because its under the power/weight ratio. under 125/tonne. as i said in my post, vic is adopting the power/weight ratio rule as well. if it's under 100/tonne (or 125/tonne for a 4 seater), its legal for P-plates (thats in VIC). In QLD, its 125kw/tonne regardless i believe.
R34 GT-T, RB25DET NEO (206kw), Curb weight 1,410kg
206/1410 = 146kw/tonne = BANNED
R33 GTS-T, RB25DET (184kw), Curb Weight 1,390kg
184/1390 = 132kw/tonne = BANNED
R32 GTS-T (Coupe), RB20DET (158kw), Curb Weight 1,280
158/1280 = 123kw/tonne = A-OK for QLD but BANNED in VIC because 2-door
R32 GTS-T (Sedan), RB20DET (158kw), Curb Weight 1,300 (working off the approximation that sedan is 20kg heavier than coupe)
158/1300 = 121kw/tonne = A-OK for QLD & VIC
Disclaimer: OEM power outputs and weights coming from wikipedia. If anyone has any more reliable sources on factory power outputs and/or weights, i'd love to see them as i've found different answers for curb weights.
Also, does NSW go by the power/weight ratio or blanket ban?