Impound them because they will ignore the ticket. This is not seizing the car, it's just towing it. One tow and they'll get the message.
A respectful person (one who could be trusted to pay the fine in the first place) wouldn't have one of these to begin with.
An ordinance as suggested by Bloody Sam seems reasonable, but they'll buy one over the internet or somesuch.
Tow the car, give them a little pain, end of problem.
So the goal is to punish people before finding them guilty, because getting a judge to find them guilty is too difficult?
How hard would be be to construct a device with a video camera/recorder, rangefinder, audio recorder, and a couple of sound-level meters attached to microphones with different degrees of directionality?
If the problem is that judges don't trust cops' judgements of distances and loudness, perhaps giving the cops the means to measure such things would solve the problem. Using narrow-field and very-narrow-field microphones would allow the cop to show that the noise was in fact coming from the suspect vehicle (if the very-narrow-field microphone picks up about as much total noise as the wide-field one, that means it's pointed at the noise source; if the wide-field one picks up more noise, that means the noise source is somewhere in that general direction but not quite where the narrow one is pointed).