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Old 03-19-2014, 09:13 PM   #88 (permalink)
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Read both articles. One said its the plumbing to the air box, if not the air box itself. The other said basically that the better filters are more restrictive and a guy who owns a diesel watched them put the filters on a testing machine for filters and filtration testing.

When I quit noticing an improvement Ill quit buying them.
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