The dealer told me anytime we get a check engine light it shoots it straight to ford database and when we flash a tune it does the same thing. So according to Ford there is no more hiding anything.
I wonder if you do a cloned ECU like the Euro guys. I have a few customers with the Bi Turbo Mercedes cars and they just buy an extra ECU, clone it and put the tune on the cloned ECU. If something goes wrong they switch back to the original ECU. One of them was having turbo issues and the dealer was not able to see anything. Replaced turbos under warranty.
http://www.autophdny.com/ecm-ecu-cloning/
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