simonr - according to Back2thefutura, K+N sell setups available in Australia.
I imported my Racing Works Induction Kit, as seen below, from the States but it had minor issues, I had to modify a few things, as the US engine differs from the Australian one in a few areas (like
MAF fitting, positive crankcase ventilation, etc).
Look at the link supplied by King Pin in the second post of this thread to see what the K+N one looks like, go to your local Autobahn and ask them if they can order one in for you.
Tim