Focus Fanatics - View Single Post - K&N round drop-in filter for 2013 Focus?
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Old 04-16-2013, 06:38 PM   #10
Elizabeth
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Join Date: Aug 2011
Fan#: 89280
Location: SouthEast, WI
What I Drive: '12 Yellow Focus SE stick, 17"rims

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I switched to the K&N filter, and also got a little MPG increase.
The filter is a cylindrical shape.
And the near edge is critical to fit INTO the groove on the far side of the box. it really matter to get the fliter all the way on, AND the filter near end fit into the tiny groove edge of the box properly.
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