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Sorry if this is old news. I remember reading a post a while back that the VAFC2 only works for awhile then the ECU relearns based on the input it gets from the 2nd O2 senor. Was wondering if you ran the mod, like the turbo guys, where you used the non-fouler plugs as a mechanical O2 sim if it would keep the ECU from getting the info.

 
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The ECU reads the primary O2 sensor for fuel trims. The secondary is just bascially there to tell the ECU if the cat is functioning properly. If you tryed to block the ECU from reading the primary O2 sensor, you'd run into major problems to put it simply, hehe.

 
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I thought the vafc2 took info from the first o2 sensor adjusted it and then released it to the ecu. I thought they said the ecu found that the info was not correct from the 2nd o2 sensor. I could have totally misunderstood but how else woud it find out that you were trying to trick it or is the whole thing about the ecu relearning wrong.