Deleted cats and ses light
However, the rear O2's shouldn't really have much of an affect on fueling from what I understand. The front O2's are used for AFR feedback to the PCM. Are you sure you don't have an exhaust leak that may be causing a false lean reading on the O2's?
As far as your question asking if the o2 sims would make the car run better, NO it will not make a difference 1 way or another.


