cummins x15

[Running rough]

It is very strange to me that most cm2350 moters I have heard run at ideal ,sound somewhat simuler to an 870 871 with the concept gears and idlers on the front geartrain, concept gears are usually found on engines with 525 hp and above from the factory, however I can tell you my cpl3606 cm2250 sounds noting like that, it has more of a rattle at ideal, not sure if it has consept gears or not, but it sounds more like a cat