I would just like to add that I have a 2003 F350 6.0L 4x4 dually. Its at the dealer right now. It has a cold weather problem. They have reprogramed it and replaced two injectors. They hope this will fix it, but not sure till they install the last injector (they one had one in stock). My truck also has a edge juice with attitude box and 4" pipes and K&N Airad system on it. I figured I would have a hell of a time getting them to cover this under warranty, but they never even said a word. Just told me that all would be covered. I guess I lucked out.