Exhaust rattling after header install

[shxdow5oh]

I just installed looks 17/8headers catless on my 2021 mustang gt and I’ve been hearing this rattling noise coming from under my car usually sounds like it’s coming from right behind my front tires and I can only hear it at startup and accelerating usually quiets down when the car idles down

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[shxdow5oh]

This is the video of the sound

 

[iamcvr]

Those are the connecting bolts between the header and the cat/cat-delete pipes. They are not normal bolts - they have a weird C-shapped connector, and then a long piece of metal w/ a 90 degree bend that is supposed to go over the piece of pipe that connects the header collector to the cat/cat-delete pipe. If they aren't installed PERFECTLY they will cause this rattle to occur. The solution is either to attempt a re-install of the bolts, or swap to a more standard nut and bolt combination.

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