I am also curious as to why V&H would say to be 'very careful' in auto tune.? Could you explain?
Because if you burn the map without reading the instructions on how to do so, you can jam up the ECU pretty good.
I.e.: someone whom just throws the unit on the bike and does not read instructions. When they rip the map off stock ecu to save as the "stock map" and don't do it properly, there's a chance you don't save the map complete or you corrupt a file etc.... auto tune for the FP3 is Very specific on how to achieve a proper "auto tune", meaning you need to follow the instructions to a T. Failing to do so ends up in a "over cooked map" which in itself isn't that bad a issue, until your trying to reload the stock map to start from again...