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When I purchased my Box 2 years ago, I went through and checked the air filter and discovered it was a K&N clogged with debris. I changed it to a OEM filter after a year, I cleaned the K&N re-oiled it and use it. The sound from the intake is much more pleasurable with the K&N. I never checked the MAF as I have not codes.
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5280 Cruising @High Altitude
Seal Gray & K&N Filter
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