Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Breather filters???
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Old 02-09-2013, 10:16 AM   #8
jetrinka
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Actually that tube is the intake side for the PCV system and a filter shouldn't be put on there. The air going through that tube is metered first by the MAF and if you take that tube off, block off the intake port and put a filter on the valve cover, that air being sucked in would be un-metered. It would be a small amount and the car would compensate for it, but it still wouldn't be right.
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