o2 Sims
You could also have my guy tune the car for you and delete the rear 02 sensors. He charges $100 for a base performance tune. This will also tune out the skip shift.
The ones in fron t of the cats are to allow the pcm to monitor part throttle air fuel ratio, the ones after the cats on 96+ cars are just to set a CEL if the cat stops working that is the one and only thing they do they have zero impact on performance.


