I agree with the points raised by both both Roger and Mark; although I'm not too sure about Roger's theory on wrong-side-of-road-head-on crashes.
I've driven on your roads a few times; and have frightened the living bejabbers out of myself on more than one occasion, due to my instinct to drive on the left kicking in.

Another valid reason for not driving a V8 is the cost of our gasoline: NZ$7.70 per gallon.
Approximately US$5.40. (Although the exchange rate fluctuates, and at the moment we're tipped to devalue against the US$ making your US$ able to buy more.)
So a V8 gets pretty expensive to run!

You'll find NZ hot-rodders a pretty egalitarian bunch; (especially if they're NSRA or Maverick affiliates,) who will welcome you and be only too happy to make your trip here an enjoyable one.

(And we need your overseas funds! Bring [and spend] lots of money!)