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Tuner or programmer


Mcheil83

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I have a 2015 Sierra 2500hd with 4:10 gears. Looking into getting a bigger camper an I  Was wondering if a tuner or programmer would help with my towing. First What is the difference between the to. I can’t afford a Diesel or else I wouldn’t be asking this question.  I live in PA an a friend of mine bought a programmer for his F-150 an the speed shop said he has to put his stock back in an drive 20 miles or so before his inspection or else it wouldn’t pass, what is that about and do you have to do this with a tuner as well, (like big bear) Thank you everyone in advance for your input

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