The bureaucrats are at it again. The latest issue of 'Motor' has an article on proposed draft rules which seek to prohibit many of the common mods which we take for granted.
For example, replacement cams, carbies, engine management systems and exhausts are to be banned unless they meet existing noise and emmission requirements and a replacement engine can't have any more than 20% power over the original (unless it meets a bunch of approval codes).
The draft proposals can be viewed by going to www.dotars.gov.au
and search for "NCOP".
I suppose replacing cams and re-flashing ecu's is hard to detect, so mightn't be as big a deal. But aftermarket exhausts may be harder to work with, especially as far as meeting existing noise limits goes.
And I guess fitting a turbo motor to a n/a xr6 is a no-no too, given it's greater than 20% power increase.