I am posting this FYI to give an insight into the process/experience for those who have yet to encounter this - not as a complaint.
In Early February I received a letter from Victoria Police Traffic Management Unit (Frankston) advising me that I had to present my car for inspection (within 7 days).
I rang the officer who issued the notice and asked him what the problem was, he advised me that he'd received a complaint that the car was too loud
I explained that the car was not regularly driven and that it was stored some distance from me and that it would take some time to ameliorate the issues. The officer took my mobile # and said to give him a call when it was done.
A week or so later I emailed to advise that it would take (another) 2-3 weeks to fix everything - he responded that that would be fine.
In the mean time I made up some 2 disc baffles for the side pipes - these are very effective - basically 2 discs with offset holes
and some restrictor plates for the collecter

also very effective but makes the car hot and not recommended - also didn't hold up in my case - probably too few holes
The officer I had been dealing with had an off-sider who came with him to do the inspection. They were both affable and professional in their approach. In some respects the car presented a bit of a conundrum [particularly the obvious signs of there having been a windscreen and there being no washers/wipers] and they made several enquiries of me on what my understanding of the 'rules of club reg' were - they weren't taking my word for it just asking - they checked everything with VicRoads. The inspection was very thorough.
The inspection was done in the car park next to the Police complex - I did ask if I could take a photo of the officers with the car but they didnt think it would be a good idea - during the process a number of other officers came over to have a look/ask a few questions.
At the conclusion of the inspection the officer told me that he'd contact VicRoads to clarify a few things and get back to me, which he did on Monday, telling me there was a defect notice in the mail.
So I guess I have some work to do -
LoBelly