Does anyone know if there are any difference between the two from CAT back? I want to replace the pipes but, the ST is a lot harder to find than the GT parts.

ST is smaller diameter than GT. I don’t remember exact sizes but I want to say it’s 1.75” vs 2”.

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I really don't care about the size diameter to be honest if I am replacing the whole thing anyway. I am just wondering if the GT exhaust can work (mounting and hanger) on ST model. I am assuming it will because I have been looking at both and they seemed similar (beside diameter).

This post has been edited by celi_wabbit: May 8, 2019 - 9:46 AM

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I'm sure the hangers are all the same, but it's not just the pipe diameter that would be different, the hole spacing on the flange is likely to be different, too, so it will not bolt down to the B pipe. The seal will not work if the pipe diameters are mismatched. The header is obviously completely different, and I would guess the B-pipe, too (the one that does under the engine).

If you can weld I'm sure you can make it work, but I would not just expect it to bolt right up.

Yeah, I think your right! so, basically there will be no issue from CAT back all the way if there are all from the GT. The issue would be if the B pipe would fit with the GT CAT flanges.

just go to a muffler shop, they will make you a new pipe

Around my area, they will charge you an arm and a leg. I checked on the ST / GT cat part number and it looked the same as far as 96 to 99, but 94 and 95 are totally different. So, after research, the only thing I found was that the B-pipe and the muffler/tail pipe are the only two that separates the two together.