This is honestly an entirely valid complaint. There are way too many motorcyclists who replace their mufflers with aftermarket ones that are illegally loud, in some cases loud enough to cause hearing damage to pedestrians.
The vehicle seems to loud -> perform a check -> if it is too loud, confiscate to have it examined and fine the driver -> if vehicle is found to have been tampered with using illegal parts, don't return it and fine some more
Then bring it back into a legal state and auction it off anonymously
I have a performance exhaust on my bike. It comes with a decibel reducer which I keep on for daily use, and remove for road trips. Making noise in urban areas is a 100% dick move.
As a friend likes to say: " Look! there goes a son of a bitch riding a noise"