I've been currently working on (sort of) replicating the engine used on the Belaz (MTU 16V4000, according to Wikipedia) on AngeTheGreat's Engine Simulator to the best of my abilities. There's a lot of inaccuracies on the item (it's hard to find information about this specific engine) and it sounds grindy for some reason when idling, but it's the best I can do. Maybe that will help us replace the current engine sound with something a bit less irritating.