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Wondering if I should flash back to stock tune with the GDE PG3 before loading stock tune to HD's PG3 or can I use the EPA compliant tune as the stock tune for the HD?
 

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In all instances before flashing any tune you should have the stock tune on the truck
 
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Yep, put that stock tune back before copying it to the device provided by HD.

Why the switch from GDE to HD?
 
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