To add to this, I think there is also a different culture in NZ - we don't crow like American's, so there are people out there making big power, just you don't hear about it. But you do see it if you go to race tracks or know the tuners, just they aren't out on forums bragging, they are most likely out there busy working to earn the money to make the power. In America it's more important to them to talk about it, and that's not necessarily a bad thing, it helps other people learn from their successes and failures...
But for a road car, big power is pointless, you can use it on a highway in America (well maybe not an LA motorway in the daytime!), but on the average NZ road it will soon throw you off if you have big power I would imagine...
PS, I agree with Loren and Sam, building a motor to then not get to use it fully seems like a waste to me. But I am a one eyed bastard like them. Now it must be my turn to get the shotgun and go out...