If you don't have emissions testing you can go with no cats, but if you do you need the cats. Cajun's the best place to get the whole set. The OEM exhaust will eventually rust out on you, might as well replace it all if you can.
headers and exhaust
My 2011 titan pro 4x has a cracked exhaust manifold so I'm looking into headers. What's the best combo as well as cats or no cats?
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