No fault codes in the ECU. The car is with KrazyHorse. I am confident they know their way around the 3w, but this seems to have them stumped. They have even been on the phone with S&S directly to try to route cause. Agree that random part changes is not very scientific but after working through the diagnostic data that is what they have had to resort to. I will double check what dynamic data (on the road or on their rolling road) shows. That hasn't come up in conversation so far as I didn't know the software gave live data also. Thanks for the support.