friend of mine was pulled over by a black 380 with very dark tinting. didnt get rego, but you can faintly see the light on the parcel shelf.
also, i have multiple reports of a white commodore (dont know the shape, but its the one with the round headlights and tailights i think) purple ss kit, v8 supercharged engine, numberplates "SIREN". it pulls up next to people and tries to race them. once the poor victim has started going, they put on the red and blues, and ur busted. its about as quick as the red highway patrol cars. very scary.
also, dont try and outrun those red highway cars either. i saw one chase someone before. took 5 secs to catch the person who was doing bout 140kph, from a standing start scared the shit outta me!