Recently in BeamNG.Drive, there have been a decent amount of good quality mods. Some of them modify official vehicles, and others are completely from scratch. I notice when using these mods, most of them are much louder than the default vehicles. This gets a bit annoying because I enjoy playing music while I drive around. The loud vehicles can be fixed by adjusting the volume, but when I wish to use official vehicles (or older mods) I can no longer hear them adequately. I think possibly setting a maximum volume in game for mods could be a solution, or you could just boost up the volume of the official vehicles. Then we could lower our global volume.