Could i just replace the sound of the old car with a newer one?Exterior sounds don't work in cars that haven't been updated for the big sound engine update which was 2015 iirc. Maybe get some mods that are up to date
So today I tried it, when playing offline everything worked, but online I couldnt hear the cars :/Yes. That can be done very easily in CM, content->cars->select cars, then click Replace sound. Sound isn't the only thing that isn't up to date in mods that old but whatever floats your boat.