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It may void the motor and trans warranty if something were to happen to them.
Read up Magnusson Moss act... If the programmer causes a failure it voids the warranty.. Programmers can effect a lot of things, shift points, fuel mixture, spark ignition point, amount of fuel, computer input information such as oxygen sensor, temp, oil pressure, fuel pressure, timing and knock. Since it effects so many things and Ford can read if you connected one and modified the stock program it can void any damage just by pointing to the fact you used one. Ford has a team of lawyers to deal with it and you are 18 so can not even be a lawyer. The truth is ask yourself "is it worth it"?. If yes then by all means go for it....