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Old 03-26-2012, 04:57 PM   #10
Focus Rookie
Join Date: May 2011
Fan#: 85831
Location: NB, Canada
What I Drive: 2012 Ford Focus SEL Tuxedo Black

Posts: 10
FF Reputation: 1 12SEL Good Standing Member
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i think its going to be a similar sound and performance upgrade as taking the lid off your stock air box and a high flow filter.

im sure the same crowd that chimes in on the taking your lid off your air box will ruin your MAF sensor will be chiming in here anytime...
just a side note ive been running my air box without the lid for a couple weeks now rain and snow, i drive about 70km a day (43 miles for you american types) and have had no issues on check engine lights, im getting around the same mileage as i was before.
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