I don't know much about EFi accept that it makes huge power and that i want it someday. From what i understand you can tune your Allison to handle the power better. Anyway getting to the point, I was wondering if it was possible to have a switchable TCM for different power levels? I know that there is like a 5 tune switchable ECM but your tranny takes time to learn each of those tunes and you can hurt even a built tranny if your not carefull. If you had say a 5 tune switchable TCM could you switch both and then drive it like you want to?