I ran over a spare tire in the road in the wifes GTCS and ended up denting the right cat. It rattles now at low speeds and I think I knocked loose a plate in the cat.

I pulled my H pipe and Cat set up for my LT's on my 06. IS there any diff on the two pipes from my 06GT and her 07 GTCS?

Thanks

 

I didn't notice any differences between my '05 and '07. I think it's a pretty safe bet that they're the same.

 

Is it possilbe that you just broke a weld and knocked a heat shield loose? If so, a worm clamp is a much more simple fix.

 

ok,what is a worm clamp?

also if I have to change it, is there gaskets between the manifold and the H pipe cats?

 

Worm clamp, hose clamp, radiator clamp, screw clamp, etc... The stainless steel clamp that most CAI kits use, where you tighten up by turning a screw... very thin metal. If a heat shield is loose from a cat, then all you may need to do is wrap one of these on the outside. Yes, they do come big enough. Grab a tape measure and measure the OD of the cat before running to buy one. While youre measuring, you should be able to tell if the heat shield is loose or not. I'm purely guessing based on what you're saying it sounds like. If so, you won't need to take anything apart. There weren't any gaskets on my car when I changed my H-pipe. Good luck.