Mine's too new, and I am too chicken to go this far yet. I want too, but I don't have the $$$ buffer to cover worst case damage and Chevy telling me "Sorry, it's not covered". I drove both engines and both seemed to have more than enough power for my needs. My reason would be better MPG's. Some day....
Should probably point to that dedicated thread on the Tune's. Although they are too damn long for me to read. Maybe they should start a Tune Too (Two) thread.
There are a LOT of threads on tunes, and yeah, I agree that the one you're thinking of is far too long for anyone to digest... but the powers that be here really like the idea of consolidating threads; that thread is really two or three combined, making it even harder to follow. What can you do, their forum, their rules.
Again just the basics; the Trifecta tune works in a ghost mode which has proven to be undetectable by Chevy service mechanics, including a couple of Sonic enthusiasts who knew what they were looking for. Could that change in the future, sure, and could it void your warranty, yeah arguably it could. But thus far hundreds or even thousands of Sonic and Cruze users have been running Trifecta and still gotten warranty service. Also, every tune I've heard of so far has included a way to go backwards, reinstall the stock tune, so nervous people revert to stock before taking the car in for work.
BUT you probably don't want one. Thus far I haven't seen any evidence that any of the tunes actually improve mpg. More power, yes, particularly on the 1.4T, very yes. But mpg, well, it looks like GM knows what they are doing as far as that is concerned. Better mpg comes from learning to drive more gently, and to a lesser extent from doing streamlining mods, adjusting tire pressure and things like that.
I like having more power, more torque, I really enjoy it. But I'm the first to admit it isn't at all necessary, the stock Sonic, particularly the 1.4T, but even the 1.8, has plenty of guts to do everything the car needs to do, more power than most in its class. And the mpg is also already pretty darn good, spending hundreds or thousands of dollars for a slight gain in mpg will almost certainly not pay for itself over the life of the vehicle.
