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There is something wrong. Harmonic resonance is B.S. cars are designed to not have this. I would not accept this as an answer. They did not make noise before the tirechange. If harmonic resonance, as they claim, this puts wear and tear on car. Should not happend due to tire change. I wondered if they knocked out rear alignment. Edit just saw they were making noise before lol. But I would think it is something to do with alignment. Only other thing is that a bad trunk or window seal can make that noise. It will disapear with windows down
You might try to do some gentle swerves back and forth at the speed that the noise is the worst (esp if its a lower speed as i think you described). That should load/unload the suspension/tires/bearings in different ways. If the noise changes in any way while you swerve, it may help you determine which corner it is coming from, and possibly which component is giving you issues. If the noise is still there after a tire swap, dont ignore the possibility of bearings, diff noise, etc. Im no mustang expert, those are just general diagnostics that have helped me out in the past. Good luck!
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