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Old 10-08-2012, 08:58 PM   #6
Japanrot_325i
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Join Date: Sep 2012
Location: Martinsburg WV
Posts: 223
My Ride: 03 325i
Never looked into to any data but I would imagine a higher quality cloth filter would have better filtering qualities than a paper one plus the oil on the filter catching even more particulants but that's just me I'm not a doctor

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