It's actually only two states that have introduced this, NSW and Victoria. In Victoria, it's straight power-to-weight, but NSW foolishly made it V8, Turbo, S/C, Modified or "High-performance 6 cyl" engined cars, which means that you couldn't drive a C180 Kompressor or Volvo T5, but could drive an Elise/Exige, 7 rep, or basically very fast 4cyl cars. This applies until you're off your P-plates (20 at the earliest)
Faster, faster, faster, until the thrill of speed overcomes the fear of death...
– Hunter Thompson