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When I bought my Ranger, it has a K&N in it. It was running rough, and I realized that the MAF sensor was gummed up. I suspect it's the gunk that you use to "oil" the K&N, and after the first time I had to clean it, I realized that it's a messy job, and the old oil and dirt ends up in the storm drains, so I just tossed it and went back to the OEM. Absolutely no difference in mileage or power (though it runs better now that I cleaned the MAF.)
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