Well I basically have a stock truck, and I have the canned tunes now. I can definitely say they have made a big difference for my truck. But I did order a custom tune (87 performance) just so that I can run the 87 octane rather than 91 or better. I have seen on other forums where people, with basically stock trucks like the custome tunes better. I believe they say the shift patterns get better as with a couple other factors...someone else that knows more than me can chime in on that factor. But thats just my experience with it so far
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