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Found the same issues with the flowmaster one. I logged the truck and found the the torque tables are set very low and computer thinks the engine is making to much power and throwing it into fail safe mode. Plug in tuners wont work on mine. Reflash tune is the only thing I can use on mine.
I am assuming other trucks have the same settings since I hear the same issues. These computers are extremely adaptive so you can try clearing it (disconnect battery) and driving it hard for a couple hundred miles then reinstalling it. Other than that you might be in the same boat as me.
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