this will make interior sound more had a bass effects & more isolated. WARNING !!! maybe some of the existing sound mods will be weird if you combine them with this mod. therefore you need to update the sound mod to the latest version + also need to change the sound configuration. work on all default scs truck,rjl scania,eugene scania,fred scania,daf schumi,mercedes schumi or truckmods with default scs definition Credits: BWS(Bimo Wahyu Saputro)