Yeah Wakey, the rules were changed back some time, as Pete says.
The current scenario, as I understand it, in NSW, is they can invite you back to the shop to do a noise test, but I don't believe there is a legal requirement to do so.
I certainly would elect to not. I used to do vehicle noise testing to the RTA some years back (way before they got their own gear) and it is very interesting, and subjective, as to a noise level and its perceived annoyance factor - indeed, whether or not it is in fact legal!
I have had noise discussions with a Mr Plod on prior occasions as to how extra noisy my exhaust was. In the end we both walked away - him without writing a ticket, and me with my ego intact. I would do it again, especially with the muffler (well technically it is one) fitted to my Sport.
Worry ye not, Wakey, go ride!