Just curious if anyone has had any adverse effects of running an o2 simulator along with a hi-flow cat. Would there be a chance of the car running too lean?

I was running the Perrin cat-delete with O2 sim, but got tired of showing up at work smelling like carbon monoxide poisoning! So, I put on a cat. No more stank. Still no CEL, but don't know what the o2 simulator is doing to the signal to the ecu. Any thoughts? Should I take the sim out while running a cat?

 

There are many topics on this subject. In short, the 02 sensor has no effect on the performance of the car, it is strictly for emissions.