Just aquired a sunfire for a demo, Anyways Im looking to see if anyone knows if these things will even run half decent with out o2 sensors and if anyone makes just a header flange for these?
What year? What engine? Filling out your registry gets you quicker answers.
if someone can program a returnless calibration then yes it will do fine without and O2. you need the front one , but you can buy a simulator for the rear since i imagine youre removing the exhaust.