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Yah, I know. They are very vague. There is a small blerb on hotrod, custom cars and engine and exhaust must meet OEM standards for that year and must meet emission standards. I say the final ruling is as long you install "approved" parts you should be fine. As it is right now, no one makes a LT/cat combo that won't induce a CEL. I would love to install the set from American Racing. But these will require a tune to prevent CEL. As soon as you tune your engine, that's it, no powertrain warranty! I am hoping that somewhere, someone will come out with a 100% bolt on, emission compliant LT and Cat system that won't void your warrant.
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