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Hey everybody I had a question about installing the php hydra on my 2002 7.3. It already has a small program on it and was wondering do I need to flash it back to stock before putting the hydra on there? Thanks!
 

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Yes, definitely flash it back to stock before adding a chip. “Stacking” tuners is a bad idea, a recipe for a smoked transmission or blown engine, if it even runs right at all


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It doesn't matter what has been programmed on the PCM the Hydra chip will override it. You can't stack chips/programmers on a 7.3 like you can on a Cummins the electronics work differently.
 
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