Did you reconnect both O2 sensors? You have two of them. I guess if the headers have some sort of flaw in them, or were not installed properly it might cause the CEL. But, as far as I know the only things that will throw a CEL as applied to the exhaust system is the O2 sensor. Either too high voltage or too low voltage. Meaning either they are disconnected or bad, or there is a leak and pure outside air is fouling the sensor signals. With the car running, check for exhaust system leaks by ear. It's pretty easy to hear them. Also, recheck that the connections are solid. Even try unplugging them and replugging them in. See if that fixes anything.
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