There are two parts to the picture. The first part is the engine management side. The ECM directly controls what is going on inside the engine as it pertains to AFM. The CCM controls the AFM and NPP valves. Because the CCM controls these entities we do not have a way to tune out the codes related to on them. If the CCM doesn't see what it is expecting to regarding the valves it will set the CEL. If you disconnect them you will definitely set a CEL. If you keep them plugged in but tie them out of the way you may set a CEL at some point.
The EFI Tuning module addresses the CCM side of the picture. The module replaces the valve actuator and keeps the CCM happy. The version currently sold on our website requires that AFM be disabled all together in the ECM. Anyone using a non-AFM camshaft or wanting to go to a non-AFM aftermarket exhaust system will fall into this category. The next version I'm completing the layout on today will allow you to keep AFM active in the ECM but not need an AFM compliant exhaust system. This use case was requested by some of the C7 guys. I prototyped it early on so it is just a simple PCB and firmware change to accommodate.
Please let me know if I've managed to confuse anyone
Depending on which exhaust supplier you look at you may save yourself a considerable amount of money going with this solution.
Thank you,
Tim