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Originally Posted by Cjymiller
That reference page you linked is interesting. From my brief scan of it, it would seem CA used to allow a number of non OEM manufacturers to provide replacecment cats. They have since redacted that status of all, or some of these manufacturers but I can't determine.
If CA still allows for some aftermarket replacement cats, is it possible that a header manufacturer can pair up with an approved replacement cat producer to create a state approved header?
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I'm not savvy enough in the law to know if you can simply approve the cat or if the entire header needs to be approved for the vehicle. My guess would be the latter. Even if it's the former, it has to be approved for this specific car for this specific year, it's not a blanket approval. CA smog laws are really terrible.