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Definitely sounds like some sort of vibration noise. As previous poster mentioned, check rubber hoses. Might be why you only hear it at startup (hoses are cold and harder) vs when warmed up.

I would try and locate a vibration that is leading to the sound.

From the audio in the clip it doesn't sound like a grinding noise to me.
 

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So I had an aftermarket steel rear bumper. I then installed the exhaust spacers for my 2.5" lift. The muffler would make contact with the bumper and made that exact same sound.
 
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