you could get a reader and delete the code out of the pcm. Or you could get a O2 sim that sends a dummy signal back to the pcm. I would say the first choice is cheaper if you are doing all four. Realistically you could run are trucks with 2 high flow cats and you would pass emissions just fine.

 

Not being able to run closed-loop and always depending on values in tables that are based primarily on load would kill any fuel efficiency these heavy trucks have which isn’t much to start with.

 

Dude just get high flows instead, i've ordered 2 magnaflow high flow cats and they make my truck louder and still legal. Also i will have no problems with 02 sensors.