It's really quite simple as far as the ADRs go. The stock pipes have passed and are legal, if they are found not to be legal on the production bikes then Honda Australia has a big legal headache and a recall on their hands. Any modifications to the exhaust are illegal, no ifs ands or buts. The law is quite clear every after market exhaust is illegal and it does not matter if the cat converter is removed or excess noise. The exception would be an after market products made to the same specification as the factory product. For example if the muffler on my wife's Mazda wore out I could buy the original part or I could by a Lucas muffler made for that Mazda. If I put a performance exhaust on I could get a ticket if it did not meet the ADRs.
So lets say I put an after market exhaust on my Fury and it was louder than stock, then my bike is illegal and I can get a defect notice and a large fine. But if I could find an after market exhaust that had the cat converters and was as loud as stock I'd be OK. As far as I can tell every after market exhaust is loud, much louder than stock so you're illegal right there and I don't know of any that have the cat converters in them either so you're illegal there too. That's two defects and two large fines.
Don't believe me, ride down to Manly beach on a Saturday morning and watch the cops writing tickets for loud pipes to all the Harley boys. When I ride down I slip right past the cops and park next to them and they usually say "nice bike man".
Sorry to say Gary but your riding round with illegal pipes, most of the time you can get away with it especially if you don't piss the neighbours off but if you get stopped...well your done.
If you look most of the after market manufacturers have a disclaimer saying something like "not legal for street use, for off road or racing applications only".