That's pretty in theory, but in practice when you adhere to the rule of law you need some consistent standard to say this is when and what you can seize, this is when and what you cannot seize. Unless you can admit to having some consistent standard, such as "property used by the accused in the commission of the crime for which he is accused" (which is reasonable in my book), then the practice of your position would mean that no private property could ever be seized by a government under any circumstances.
Now it seems you admit that a gun used in a crime, even though it be private property, can be seized. In this case, the car is being used as the weapon in the crime.
I think local communities have a right to enforce laws against disturbance of the peace. If the only practical way to enforce the peace is to seize the vehicles, then it is the drivers of such vehicles, and not the local government, that has made it so. They have no cause to complain if the law is clear and equitably enforced.
I don't buy the argument that this is an infringement of liberty when the activity engaged in has nothing to do with liberty and the persons engaging in it do not take responsibility for their actions.
The other folks, the ones whose sleep is shattered by rhythmic din late at night, have to be taken into consideration as well. Apparently your attitude towards those who, on their own private property, are trespassed upon by these omnidirectional sound cannons, is that they have no rights at all.
I don't agree with that conception. One man's liberty to swing his fist ends at the tip of his neighbor's nose. In such a case as this, the fact that the car is private property is mooted by the equal property rights of the far more numerous people who are disturbed in their own homes by it, and the wishes of the people as expressed by a government elected by them.
I see no reason the government should have the right to permanently seize items used in crimes (i.e. hold them beyond their need as evidence) except in cases where the item itself was criminally acquired. I know the government routinely does such things and gets away with them, but I see no legitimate basis for such behavior.
Otherwise, the possible punishments for crimes could vary way out of proportion to the acts committed, based upon whether the accused has anything the government wants. Arrest someone for loitering while they're look at their $5,000 Rolex too many times, get a free $5,000 watch (since they were "using" in their crime), etc.