Great, took it off and checked it out.

There's no broken weld, no metal jingling inside...

Turns out, like I said before, the freakin catalytic material is broken....Not small enough for me to get out the piece, and positioned in the middle of the two biggest pieces. So, I gotta call up carsound on monday to get a replacement. Hope they ship me one first so I can drive my car still. The cat still works, just a lot of rattling at lower rpms.

I guess the high flowing exhaust at 2500+ rpms pushes the cat pieces together.

Dammit! freakin high quality my ass...should've just put on the stock type r cat.