Exhaust rattle

I've got an exhaust rattle on my 04 GT and it's starting to drive me nuts. It started out really quiet on a cold start up and is now becoming louder and lasting longer as the exhaust heats up and expands. It sounds like it is coming from the front of the car. I know it isn't the O/R H pipe because the rattle was there before i put it on. Is there some kind of heat shield on the manifold or front of the car that I'm failing to see?

BlackStang03 said:

I had a rattle on mine from the rear and it was the tips...I think i had the tips too far in, I moved them out and now no rattle. Also check to make sure all your bolts are tight.

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Was that on the stock cat-back? My exhaust is mostly stock except for the H pipe. I'm hoping it may be the EGR but it probably isn't.