You don't want to use the 02 simulator on the manifold. The sensor on the manifold is the critical sensor. It checks your ratio. If you put the simulator for that sensor it would tell the computer that the ratio is perfect all the time, meaning it would never adjust to varying conditions. You should be able to use a simulator on the rear. My understanding of the final 02 sensor is that it just monitor to make sure that your cat/cats are functioning. If I am incorrect please anyone feel free to correct me. Hope this helps.
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