Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - View Single Post - Air filter or whole intake?
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Old 05-02-2012, 09:27 AM   #5
Focus Enthusiast
Join Date: Mar 2012
Fan#: 96939
Location: Mt. Orab, OH
What I Drive: 2006 blue ZX3

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I had the non-replaceable filter box in mine. ripped all that out and added a cone filter to the down pipe (with the maf sensor) comming from the upper box.
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