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https://www.vicroads.vic.gov.au/safety-and-road-rules/vehicle-safety/vehicle-standards-information If you take a look at Vehicle Standards Sheet number 8 on this site, under section 13.7 it states: "To remain within the scope of this section of VSB 14, a vehicle fitted with ESC must not be modified if the operation of the ESC is affected" Since fitting rims & tyres of an identical rolling diameter to the stock setup won't affect the ESC, there is nothing unroadworthy about the wheel setup. This link shows the difference in size between the original setup on the rear, and the current setup: http://www.willtheyfit.com/index.php?width=245&aspect=45&diameter=18&wheelwidth=9&offset=15&width2=275&aspect2=35&wheel_size=19&wheel_width=10&offset2=20 You'll notice on the left hand side the difference in rolling diameter is negligible and the track width increases by 7.7mm (you're allowed to go 25mm wider in track in Vic). So the Vertinis aren't going to affect the roadworthiness of the car.
I'm in country Vic and I don't do a lot of driving so I haven't been hassled over the exhaust, it's quite easy to keep it sounding respectable if you are light on the throttle. It's when the car is under load or at high revs that it starts to get louder.