(Vehicles below are just examples, you could be easily be driving something unlisted!)
A Class – up to 1600cc
Many late model FWD cars, including Civics, Excels, Lasers/323s and Corollas, as well as some older RWD cars like Datsun 1600s (with the 1600 motor), early Celicas and Corollas, some Escorts and early and late Galants/Lancers.
B Class – 1601–2000cc
A mix of FWD cars like Honda Integras, some Lasers/323s and Corollas, and RWD models like Beetles, Datsuns, Escorts, Celicas, Galants/Lancers, MX5s, Eunos 30X, BMW 318's and even Mazda RX series cars with the 10A motor.
C Class – 2001–3000cc
A good mix of cars including some six cylinder RWD Commodores, Skylines, 240/260/280Z Datsuns, rotaries with the 12A or 13B motor, many BMWs, FWD Camry's and some VWs. Plus the occasional Porsche...
D Class – 3001cc and Above
A mix of RWD Commodores (including V6 and V8s), Falcons, big V6 Magnas, Starion Turbos (or any turbo car with an engine capacity above 1760cc), Soarers, 180/200SXs and Silvias, Supras, Focus XR5s and even Cobra kit cars...