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Message: <blockquote data-quote="wfooshee" data-source="post: 997783" data-attributes="member: 6354">I see it's a bit one-sided, as well. I wonder if there's a blockage somewhere, forcing more exhaust out one side than the other. The discoloring is after the catalyst, which sits in the center section that the headers feed into. None of which would have anything to do with the O2 sensor, which is (barely) ahead of the catalyst.In your original post you said the headers were turning blue, but that's not headers there, thus everyone answering a different question all this time.</blockquote>