I tuned my '15 ecoboost mustang with the ford performance calibration and the GT 350 CAI set-up. I was wondering if anyone knew if to tune the ecoboost mustang with other tuners like SCT X4 or Cobb, would I need to tune everything back to stock or just change the tune/calibration back to stock? Can I keep the CAI set up from the GT 350 or do I need put the stock air assembly back? I know for sure I have to take the tune back to stock formation before adding another tune, but I'm unsure about the air filter assembly. SCT doesn't seem to know exactly what I'm trying to ask them.