Ditto on the hide your bombing mods before bringing your truck in for any service. I was in an argument with my dealer in DE while in there buying trim screws. He saw my truck and asked i guess had never seen the cummins engine (Thats reassuring coming from the service manager at the dealer). He saw the 0880 filter (before i had the psychotty on it. And asked if it was stock. I told him no, i added it and the first thing he said is, "oh, you know your warranty is void then" When i asked him why he said, "you cant modify anything the engine in any way" i asked him to show me in writing that i cant change the air cleaner. Obviously he could not produce that info. At that point a much more intelligent DC employee filled me (and the incompetent service writer) in on the details of the warranty issue. Which as mentioned be others, a part or parts, will only be voided if a customer modification causes the failure. But they cant just void your whole warranty because of one modification. And they would have to try really hard to prove that changing the air cleaner could damage something on the engine.