if you look at this thread http://www.fordxr6turbo.com/forum/index.php?showtopic=35553 there are a few nz members posting in thes thread. have a chat with some other kiwis and see where they are getting tunes at. I would be looking at a boost guage to see if your boost is surging if not it may be fuel supply, intercooler and pipework mods are no problem. there are people who can tune these cars in 1 hour its not rocket science.