howarmat

I dont think you can do it with the SCT....

91GT

So let me get this straight, i'm running stock exhaust except for the pypes axlebacks on my '05 GT and if I get the pypes h- pipe and keep my stock cats it will be louder? Also should I get the h pipe or the x pipe?

howarmat

pypes h-pipe deletes the cats. ....its a straight pipe.

91GT

So can I keep my cats and make it louder or does someone make an h pipe with hi flow cats?

howarmat

its tough because the removal of the cats is why they are so much louder. Get new headers could make it louder also.