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My guess (which is a good one) is that o2 sensors are experiencing large amounts of unburned fuel and or heat which headers and high flow cats usually will cause. Simple fix is to buy an Anti-Fouler from auto parts store which can fit your O2 sensor and thread into your header/exhaust system...
Drill a larger whole into the anti-fouler so that the head of the o2 sensor can thread all the way into the anti-fouler.
By installing this, you will be setting the o2 sensor back a bit out of the way of all the heat and gases and will likely eliminate your CEL issue.
I had to do this to my friends Acura RSX Type-s cause he bought a Header kit that eliminated the cats. The after-cat sensor required the anti-fouler in order to keep the CEL by O2 errors away.
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