If i know the person down here (ie bunbury) i wave, otherwise the rest i dont bother as they hoon around and cause trouble. Up in perth if i'm driving the 32, which hasnt happened in a while, i will wave if they wave pretty much. The early Z's down here are usually tucked away and don't come out much, these guys i chat to a bit when i work in town and we get along ok. Silvias are the same, quite a few down here are kids and arent polite