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I put a used FT86SF catted header on my car recently. It took about 3 days before the CEL came on. Luckily, I was on my way to get the car tuned when it happened.
I have heard some people have no problems, but some do. YMMV. I don't think the CEL will go away on its own either way. It will probably need reset regardless.
Edit: I do LOVE the difference it made in the torque dip, even before the tune!
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"To be without silver is better than to be without honour." - Norse Proverb
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