Look, the hot ticket is go to an exhaust or muffler shop and have them custom build from headers back, one smooth MANDREL BENT 3 or 2.5" set up depending on your application and HP goals. If you want to go ahead and keep the cat... or don't. Just depends on how through your smog shop is, or who you know there. Just make sure to have them install at least one flex fit section just past the headers, the steel braided mess you see on down pipes, this way the exhaust since isn't hanging on your red hot headers slowly bending them till they crack. =) Good luck.
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