 K&Ns are not for diesels.  There are many waayy better choices. Yall using them with "No problems"..... Good luck with that..
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"Blizzard" The big white bio-burning 03 7.3 4x4. 6637, straight piped stock exhaust, and a "New" secret blend of Haul a$$ing mods and upgrades. Suffice to say, its not the fastest, but it quite possibly is one of the quickest.
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