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Not all tuners are programmed equally. Some are better than others for each type of truck. I didn't like the edge on my Duramax at all. The PPE tuner was even a little better than even my current programing on the Dmax. I'd suggest doing a little research and ask some questions on one of the Ford diesel forums to find the best tuners for the Fords. All the current generation tuners are emmisions friendly (EPA Smack down).
That said, your probably better off leaving the programming alone unless you plan on doing a full delete.
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