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Exhaust leak, make sure you loosely tighten all your bolts before torquing them. Did you install any new gaskets? If you drive like this for long enough, eventually when you take it apart you will find out where it was leaking from, there will be exhaust soot making its way out of one of the flanges.
Video two almost would lead me to believe you have a bit of vibration/resonance as well. Fix the exhaust leak first and then if it doesn't go away see if there is some heat shielding rubbing. Could just be a raspy header/exhaust combo though...
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