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Re: new Duramax owner
Do not use a Tuner, It will leave traces in the ECM & GM will void your drivetrain warranty.
When I worked at a Dealer we had to snap-shot all the CVN numbers (Calibration Verification Numbers) & send them to GM before they gave the go ahead on any drivetrain repairs.
Manufacturers today have zero tolerance for this on Diesel trucks.
Nice Truck!!!!
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