Car insurance for an imported vehicle can reach cost thousands. Import car insurance can be super expensive as these vehicles are generally modified or not manufactured in Australia and therefore aren't like the standard vehicles available. Insurers see imported cars as a greater risk on Australian roads which explains their sky-high insurance premiums.
If you own a cheaper, low performance import and are looking for a cheaper premium the best thing to do is shop around and compare quotes. Online insurers are a great place to start.
RateCity offers live quotes from several car insurance brands in a single place, though some of these brands are unable to offer coverage on certain kinds of imports.