If you click the link I posted @ the top of this page, it tells you what you need to do. This works. My truck has had the 02 simulators on it for well over a year with no cats, and never had a CEL.
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Im not going to say that I approve of this, nor will I name any names of possible people I know, but if you leave the rear O2's after the cats out of the exhaust pipe, and expose them to constant fresh air... I dont know, like attached to an open area under the frame, that the O2's will recognize the difference from the front o2 sensors and wont kick a code due to the computer thinking the Cat is working.... just something I have seen done with certain OBDII vehicles... .
I keep answering this question, over and over again. click the link........
http://www.gmt400.com/threads/remove-your-cats-and-make-a-mini-cat-for-your-rear-02-sensors.30681/