Weird noise coming from bottom of my car?

Ok so i own a 2002 Ford Mustang GT, and there has been this weird, weird rattling noise coming from beneath my car. I'm running an SLP loudmouth aftermarket exhaust and i'm wondering if thats the issue. I'm no mechanic, so i wanna know what i'm gonna be dealing with before i go see for myself. I'm 16 years old as well, I'm also running a bbk offroad x pipe and stock headers(its pretty loud), so i'm wondering if that may be part of the problem too

There's a stainless steel shield welded to the underside of the cats, to keep stuff from touching the cats because they are very hot. They are only welded at four small points to the cat, so they do come loose & rattle. You can either pull it off - AFTER IT COOLS, or connect a couple of long radiator hose clamps together & tighten it up to stop the rattle.

Depends if you hear it when you accel. If so possible rattle of exhaust. Check clamps and make sure rubber holders are on. You don't give enough info for me to really tell. Let me take you to heaven right now.
google search ETCG, go to that website and become an angel

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