I haven't had any issues with my 2012 truck other than wondering how the trans should shift and if it was doing everything correctly in that regard. The only issue was just updating the sd card and that seems to have been discussed and worked out enough. Have a second card when updating so you can always have the original or if there is an error reading. Format the second card and don't use the usb to micro adapter use the sd card adapters that will come w the second card. I wouldn't choose a dif system unless it was the mm3 personally. With the Ultra/mm3 you get a system monitor and more on the fly adjustments vs other systems. I'm on the fence about custom tunes, I have never heard any clear cut "this is what I do that is better than the stock tune" and I'm not really willing to spend another $600 bc people say it runs better for them, bc that statement is not an objective analysis, nor is a dyno when considering all the aspects. Plus it runs fine currently so.... I am still on a .11 update and like my computer system software will wait for a majority to try it, fix the bugs, fix some more bugs and usually a year later switch. It's why I bypassed windows 8. Plus, as far as the truck -it requires a transmission relearn each time.
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