Anytime a "chip" is physically installed on the PCM, the tuning on it will override whatever tuning is flashed on the computer. Whatever is flashed to the PCM already (stock or otherwise) becomes null when a 4-bank chip such as the Hydra is installed.
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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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