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The SES light came back this morning on my drive to work.
It'll probably be a little while before I have the time to pull the intake off to get a good shot of the wiring.
I'm thinking there's a possibility the O2 sensor got tweaked in some way during the downpipe install, but my next step is to do that jumper wire as described in the install notes to bypass the DP fix and see what codes I get. If the code switches to the usual P0420 or other catalyst efficiency codes, then I can probably conclude the O2 sensor is ok, but if these codes remain with the DP fix bypassed then it's probably an issue with the sensor and/or the wiring.
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