Ford Focus Forum, Ford Focus ST Forum - View Single Post - intake manifold butterfly flap issues
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Old 08-30-2012, 09:59 PM   #11
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You have to tune either way or you'll get a CEL. they're supposed to help with low end power and economy. But they also hinder overall power.
2014 Focus SE Manual -
2006 Focus ZX4 SE Auto -commuter 110k /traded
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