Kiwi Cars

I was in Wahroonga this morning where I spotted 2 New Zealand registered cars driving on the road. One was a standard looking new model C-class Merc, the other a much modified white Subaru Legacy GT-B (previous shape).

Is it me or are there more and more foreign number-plated cars driving around at the moment? Have the rules for importing or registering cars in Australia/NSW changed recently?