A wideband has a simulated narrowband output for the ECU. Our ECU's will not understand a wideband's signal at all. You'd have to be running a different ECU to take a wideband signal. I haven't used it myself at all, but from what I've read and researched myself, a true narrowband will give your ECU a better and more accurate signal than the simulated one that the wideband outputs. What most will do is get a new bung welded in for the wideband and run that to their gauge in the car, and keep the narrowband running stock to the ECU. This way you know you're ECU is happy with the signal, and you are still getting your number readings that you are concerned about for tuning.