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Message: <blockquote data-quote="MustangChris" data-source="post: 1087669" data-attributes="member: 10830">eh.  we have our moments of chaos... lol.but i highly doubt you need a re-build.running without o2s makes the CEL come on, some say the car runs richer with the CEL on... i dont know about that...also, your cats arent taking care of unburnt fuel in the ehxuast...finally, you're sitting at idle. ... your thorttle plate is closed... your car is sucking air through a straw.  the OEM tune may work fine in Detroit, but wherever you live it might be a little off....I wouldn't worry too much about it.  I suggest putting cats and rear o2s on.  I also suggest leaving the rest of the emissions systems in tact.</blockquote>