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Old 03-12-2013, 12:45 AM   #51
Focus Rookie
Join Date: Mar 2008
Fan#: 54362
Location: patterson, ca
What I Drive: 2005, silver, Focus

Posts: 3
FF Reputation: 1 barry2345 Good Standing Member
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I have increased my mileage by 4-6 miles per gallon, I installed a K&N cold air intake, E3 spark plugs, and I added a 3.5 inch rear most muffler removing the center muffler. This also gave me a horsepower increase of about 12-15.
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