In my 03' I have the mileage max chip, definitly got more power like it took 1 sec or so off my 0-60 times on a stock truck, and it made smoke.
THE ONLY bad thing about the chip is at speeds lower than 65 it adjusts the cruise control so that you accelerate then coast, sorta like airplanes do this can kinda make the ride a bit ruff when you arent at highway speeds. By 69 you cant notice it
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