That is what your last tuner did. Why? I couldn't tell you for sure. What you could do is rescale those to stock with the normalizer FN013 and try it........
I don't see the reason for doing what they did.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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