Boom cars are becoming a plague in America.
Some cities (such as Moreno Valley, CA) have to put up with the sound of boom cars as much as 18 hours a day, every day.

The source of the booms is their subwoofers in their trunks. Nobody needs a subwoofer, unless they’re playing to a stadium sized audience.

Which kit on the following site would be best to use back upon the Boom car owner?

It should be 1) Non Lethal using force of sound, 2) No collateral discomfort to innocent cars nearby. 3) Directionally beamed 4) Portable

https://www.soundlazer.com/
(or any similar site. This is the only one of the kind I ever found, though)