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ORIGINAL: trojanhorse

well... you all make points, but sorry not much help (nothing personal) i'm the dummy who is asking the questions. ok, with my motor the actual header is cast into the head, so there is no actual header. this is the collector from the heads. so in essence it becomes the header. and i plan on doing a catback, and high flow cat. but those are plans. what i need to know is will my check engine light come on, even if i re-install the o2 sensors? the header here replaces the collector which contains a cat. I want the whole exhaust to flow. this is the first step

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