Ford Focus Forum, Ford Focus ST Forum - View Single Post - K & N filter for 2012 Titanium
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Old 09-20-2011, 09:35 AM   #4
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Join Date: May 2011
Fan#: 85422
Location: Pembroke, MA
What I Drive: 2012, candy blue, SEL

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Little to none. I have been using K&N filters for over 20 years and have never realized a measurable improvement in either power or economy.

I use them because it's a one time purchase and can be cleaned after that.
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