Strange part by my gas tank making noise?

Hi, I recently bought a 2001 ford mustang and I have a strange part connected to the gas tank that is making noise whenever i start the car. It is connected to the gas tank and rattles against the muffler whenever i start the car and will usually only make the sound if the car is cold or in park. I have no idea what it is but it s like some triangle piece of steel with some bolts in it and doesn t really seem to have any purpose. Was just wanting to see if anybody could tell me what it might possibly be and if i can take it off without doing any damage to my car.
Added (1). Hi, now thinking about it I don't know if I can remember if it's connected to the gas to but I know it was near it. I can't go out and look right now because my wife has it. It was like some triangle piece of steel that was hitting some sort of "ramp" looking thing on the muffler. Lol. I have no idea how to explain it… Thanks.

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