Failing that test is expensive, and you don't see your car again for a few weeks. They revoke your permission to operate the vehicle on public roads, so in addition to the fine, you face fees (towing, storage of car in evidence locker, towing your car to a shop after getting it back in order to make it street legal, then redoing the road-worthiness certification).

But you are not likely to see this enforced outside of rich quiet neighborhoods where police don't have anything better to attend to. Culturally, sentiment in the US does not want the law coming down hard on drivers and their vehicles. For instance, most US states do not even require vehicles to be safety inspected. And in urban areas the police have worse infractions to be going after.

It would be bad only if it didn't result in decrease of loud vehicles. If they run the dyno and impound vehicle, it means that this loud vehicle won't be coming back this street for some time.

The only provable noise polluter in that case is the police.

I'm sure they could also put my car on a dyno and prove it could go 100mph on the 30mph street I was on too.

One assumes this process is generally reserved for vehicles whose driving has earned them a dyno inspection, as it would induce mockery were they to e.g. dyno an old beaten-up Geo Metro without cause, and that the fines are directed towards either the vehicle owner and/or manufacturer, as circumstances require, as the responsible parties for its mechanical-design and/or aftermarket-modded violations of the law. (I am not your lawyer, this is not legal advice.)

https://www.buzzfeednews.com/article/salvadorhernandez/leade...

Actually, you can argue it and it will work.

The problem for both noise and speed enforcement is entirely a problem of will. Some jurisdictions simply don't care, or just do targeted enforcement to drive revenue but not actually change driving habits. Do any driving around the country and you'll see areas where people regularly drive 20mph over the speed limit and areas where people barely go 5 over.

The right thing to do is to ban their use on a local level pursuant to some specific criteria is one thing (as many municipalities do, and Portland took a step further by doing categorically city wide). To ban their sale (but not use, are you kidding?) state wide is a great example of not only crap law, but the exact sort of minutia that the state level government should not be regulating and is necessarily proceeded by the sort of evil "I know best, damn the exceptions" world view that underpins much of the bad policy that sours people on the same institutions you are trying to use to solve what you perceive to be problems.

It’s not all of them. Some ride responsibly but my god, some are extremely good at being the most annoying human beings on earth.

NYC installed these. Turns out with a city noise limit of 76 and ticketing those in excess of 84dBa, that you’ll ticket certain street ‘legal’ cars whose noise levels can reach into the 90s (!) if driven improperly in-city. Always glad to see technology progressing; I hope it spreads elsewhere.

(by appliance I mean a quiet boring car like a prius, tesla or midmarket vehicle, something that doesn't stand out - I've found those car owners also come with the dreary if I'm not having fun no one else can attitude)

If you're downvoting, reconsider not being a sour-puss and find some joy in something, anything please. It's not good to be bitter your family will suffer.

As a fellow vehicle customization enthusiast you have the flexibility to do what you want for snaps, crackles and pops up to the limit of what is deemed acceptable by your locality. It's not like a blanket ban is going to fix the behavior of people that mod their cars. I don't personally add after-fire to ECU tunings but they are popular in the bimmer community - what harm are these people causing that motorcyclists aren't?

I got the answer: it's easy to target car modders and sports/supercars because those who don't drive them are petty + jealous.

For all vehicles the police can issue a defect notice to anything that seems too loud. The owner then has to present to an inspection station and prove that they’re compliant. If they don’t show up or don’t test as compliant their registration is voided and they’re fined. Of course, they can remove the modification before visiting the induction station then reinstall it afterwards, but that gets pretty time consuming pretty fast and people largely stay within the bounds of reason as a result. The system isn’t perfect but it works fine.