Ford Focus Forum, Ford Focus ST Forum - View Single Post - FSwerks CAI installed-have resonation in cabin at high rpms
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Old 09-22-2012, 01:55 PM   #4
VEGAS
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i would check to see if its seated on the bushing correctly, Should have LESS noise when higher RPM then Idle, my FSWERKS CAI filter works perfect. no need to replace it, wont make any difference in noise.
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