Video Of An Exhaust Rattle

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Sounds like a broken baffle.

Drive the car up on ramps, or jack it up so you can get under there and kind of hit the mufflers with your fist. If they rattle, you have a not so uncommon broken baffle.
 
The baffles breaking have no connecting with what midpipe you are using. It's either from poor welds or internal rust and in turn the baffles break off.

The x-pipe/Flowmaster sound is raspy, but it won't cause the rattle you are experiencing.