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You actually only need 1 cat. I had an 03 as well, and I just put 1 cat at the back of the Pacesetter y-pipe. Just extend your rear o2 sensor, and you are good to go.
You can do that?? I have a cutout welded on the end of the y pipe, but i didnt use the other extension thats supposed to go there, so could i weld my cat to the cutout and put the rear o2 right after the cat? Or??
Sorry for thread jack hope this helps you as well bud.
Camo Ram