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I agree with all the above EXCEPT what is highlighted. Neither will improve fuel mileage. The K&N will foul your MAF and allow more dirt to enter your engine. The factory air filter will allow more than enough air for your power level. A low-restriction air filter on a diesel will not improve fuel mileage.
This is worth repeating. It’s true if you have any doubt have a oil analyst run.
Lynwood
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