Selling my Borla exhaust
Full disclosure, it has a rattle coming from inside the muffler. The previous owner of the car used saddle clamps instead of the supplied band clamps. The pipes are squeezed where the clamps were installed, making it hard to separate the tubing. The clamps also rusted right off.

I don't know what the source of the rattle is.
It is definitely inside the muffler.
Might be something simple like a piece of catalyst in there or an actual muffler defect.

I can not here the rattle from inside the car while driving.

Asking $300 obo

Here is a youtube clip

 

the video is private

 

Sorry, it was my first youtube upload.
Fixed