This is wonderful. I wish they did the same about modifications done to increase the noise. I've got 2 people living nearby that both have straight-piped their car and I literally cover my ears when they pass by. My Watch literally tells me that a noise peak happened when they drive by.
Then, review your town's ordinances and see if there's anything about passenger vehicles requiring properly maintained and baffled exhaust system.
Then, write to your city coun, mayor, and police chief (all in one email) asking why this ordinance isn't enforced? Can it be struck from the ordinances if it will never be enforced?
Finally, ask them whether or not citizens should be able to enforce the code or ordinances amid willful police negligence to do so? If not, why not? If not, csn they add "City X does not issue tickets to noisy vehicles" to their marketing material.
Ask if you have fewer rights than someone who knowingly bought or modified a vehicle to disturb tens or hundreds of people all around them at any given moment during the day without recourse?
Ask them to provide at least two good points on why a passenger vehicle should be allowed to have a noisy exhaust system.
If they can't provide a solid solution, then ask them all to step down.
(I'm on your side, btw. Not sure if that was clear from my post.)