Well i imported mine before import duty changed to 10% (was 15%) and when the aussie dollar was a bit weaker against the yen so it's not really relevant how much it cost to import.
I can tell you tho that there are a few more issues when importing a car worth over $60k like extra stamp duty and Luxury car tax that many "import cost calculators" dont take into account, then there's compliance cost blowouts like stock parts, and brembo brake pads.
It's not easy to have a good condition no accident damaged car landed and complied under $70k - then you gotta pay rego and stamp duty...