Im running a three in exhaust without cats. ive been having some trouble though with the O2 simulator sensor going bad and making the the engine run too rich and fouling the plugs. the car starts bogging down and accelerating real sporaticly.

ive replaced the O2 sensor a couple times now and it doesnt fix the problem for long. any hints, suggestions, or ideas would be awesome. thanks.

 

Are you running O2 sims in the front O2 positions? If thats the case I cant see how it will get the correct AFR as it will be trying to adjust fuel trims if you are still in Closed Loop.
You would be better of working in Open Loop mode, best of fitting a wideband for that though.

What is it you want to achieve? did you want to run without O2's?