I was one of the first on here to use the NGK/AFX with the NTK setup. I switch from AEM, LM1, DynoJet to the NGK/AFX unit based on the recommendation from Greg Banish (Calibrated Success). I even tested the originally equiped Bosch sensor from the NGK/AFX unit against the NTK unit. I no longer support the Bosch units for anything other then monitoring AFR, definately not for tuning. And at just under $400 for the setup, it is the best budget wideband around, compare to industry units like ECM Lambda Pro.