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You really need to get the car up in the air and bang around on EVERYTHING.
At this point I would not rule out a loose heat shield, panel, or something. Also I had a muffler with a bad resonator inside, whatever its called INSIDE the muffler come loose and cause exactly what you are describing.
A thorough underside exam hitting parts is first step.
Also, is the vibration/noise you hear RPM related or speed related?
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