Is the profession of selling and installing car audio devices and systems, which are mostly used for listening to music loudly, considered Haram, even with the possibility of using them to listen to the Quran and religious sermons?

The installation and sale of the aforementioned items are originally permissible. However, it is forbidden to assist someone who is known or highly likely to use them for unlawful purposes, based on Allah's saying: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression." And whoever gives up something for the sake of Allah, Allah will compensate him with something better.