Could the factory O2s be replaced with widebands and the ECM be re-scaled and calibrated?
Why are widebands not dual units?

 

It is possible to replace narrowband sensors with widebands but not the way you propose. Wideband sensors need an electronic controller. Some wideband controllers can generate simulated narrowband signals that can be sent to the PCM. The Innovate LC-1 is one such controller. Dual units are available.

 

Thanks Gary. I just ordered HP Tuner GM Pro. Now I guess i need to choose between The Inovative and NGK widebands. I havnt found a dual package yet.

 

LM2 would be a dual version. We use those alot to do what you are asking.