Caterpillar C15 6nz [1.38.x]

A Special thanks too Rc FlashDriver for showing me how to create this engine mod, I seriously could not have created this mod without his help, so please go and show him love. Thank you Rc FlashDriver for everything:) All the changes to the mod will not be in the description, all the changes will be in the change note section.:) No one is allowed to do Add-Ons to/ or for any truck without asking my permission first! Rc FlashDriver and I have worked really hard to make the engine perfect