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      11-30-2011, 03:09 PM   #16
PINeely
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Drives: 2009 E90 N54
Join Date: Jul 2009
Location: Jackson, MS

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Sorry, mispost from my phone.

^^^KN filters are made of cotton gauze, not paper, and are oiled such that the dirt gets trapped in the fibers and is NOT pulled into the intake. You never have to replace a KN but you do have to clean and reoil it every so often.
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