If the truck was tuned in the past, but it isnt now, there will not be any problems, but if it is still tuned, you should go to a dealer or somewhere and have it flashed before you hook up a gryphon. from what I understand, the gryphon changes the current tune instead of loading a completely new program for your truck's computer. that is why you want to have a stock truck before you load the tune. Also there is a computer code that you will want to send to PHP when you order, and I "THINK" a dealer could get this for you, but again I am not sure. If you do not think that the computer is currently modified then you should be fine with just ordering they Gryphon. Good luck! 
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2002 F250 MT, Bill's 100hp custom tune on the PCM, Phoenix: stock, 45hp, 65hp-wm, 80hp-wm, 120hp, and no start. pioneer nav radio, 12" memphis sub and 500W amp, infinity 5x7's, alpine 4-ch amp, stock front speakers soon to be focals
2006 Mustang GT, SCT XCAL3 91 tune, custom tunes soon, pioneer nav radio with a JL Audio W3 12" sub and a jl audio jk3602 amp. Speakers and amp soon 
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