Without the add-a-leaf kit, you won't be getting the lift you need to level the truck back out once the coilovers are installed. Secondly, even without the add-a-leaf kit, you likely won't be able to use your air bag kit with the lift system due to the new height of the rear block without at least some modifications to the air bag system, if that's even possible at all. Your best bet would be to call us directly at 1-877-578-2433 so we can get more specific about your air bags system and see if it's compatible with rear lift kits at all.