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Message: [QUOTE="TARM, post: 82021, member: 578"] Its likely the dust came thru the air gap unless you did not properly oil the Big boost. With oil you would not be seeing visible dirt. Also think just how dirty the outside of the filter would have to be. The filter is not different then all the other 5r filters out there as they all use the exact same media. But I will say if you drive in very dusty conditions, off road etc much of the time I would be getting Donaldson Brand specifically version of the 6637. The air flow works on these large cylindrical filters in a way where most of the air flow is in the lower portion of the filter near the outlet. Only as vacuum builds more and more does more and more of the filter media area get used as the vacuum column increases in height. With the shorter conical filters with larger outlets they tend to use all the media more evenly so as air flow increases vacuum will spike up. A Big Boost, 6637, Donaldson with 5 or 6" inlets would be better. That with using a intake tube with the dimensions and shape of the aFe tube as it increases air velocity and offers faster spool up IMO. [/QUOTE]

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