high speed ringing/rattle

I've got a bit of a rythmic rattle from the front end that occurs around 80mph. I do not hear it below that speed.

Sounds like two pieces of metal tapping each other. My guess at first is wind noise making something rattle. Trouble is I cannot find anything in the front bumber area that is loose or can be shaken to make a similar sound.

When it is occuring I can put it in neutral (5sp man) with any change as well as shutting off the engine without a change in the rattle/ringing sound.

other people riding in my car say its coming from somewhere in front of the dash under the hood. its absolutely driving me nuts!

2002 Mustang GT
only mods are tinted windows and magnapack cat backs.
 
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