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Everyone ?
Not hardly, everyone, meaning all of us who have been custom tuning back to the old E-prom ECMs of 1980s never had a issue tuning any of the ones you mention and the tools like Tunercats, LT1/LS1/LS2 edit filled the gaps of all the above early on.
Huge difference in a tuning program hacking a security code and today's C7's controllers learning from past hacking GM made sure it will be much harder to hack and far easier to tell if the controllers were hacked on
In the end I'd suggest to C7 buyers not to be the tuning testpigs as we saw with the C6s a huge amount of engines blown to hell by claims of "secret" tuning methods.
GM is not dumb and has learned a lot and has some surprises as what OnStar will be doing in the background to see if C7s were hacked.
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