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, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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