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  1. Humming noise when I hit 70+ MPH..?

    Previous Civics
    Hey. Iv just recently bought a honda civic 2004 1.6 sport, and dont know much about hondas. While Driving on the motorway as I go above 70+ MPH, there is like a humming noise. Is this normal or is something wrong? I have an after-market exhaust on if this helps... Thanks
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