Nothing really. Everything about the truck is just better (except the gas mileage). I'm not sure what someone would not like with a tune. It's not like you get exhaust drone or a lumpy idle when changing cams. It is just more power and less torque management at low speeds.For the guys that are tuned, what might be something you wish was different and maybe something you don’t like with the tune.
MPG doesn’t count as a dislike lol.
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