Originally Posted by Doc brown

From a mechanical standpoint, all a tune does is change the operating paremeters for the fuel system, emissions systems, torque management, and some other stuff. Sort of like the old days of adjusting timing, dwell, fuel delivery, and putting in a shift kit. It won't do anything to diminish engine life.

Originally Posted by Stryker

I ask is because I saw where they recommend a higher degree thermostat because it allows them to be more aggressive in the tuning. Which to me, means more stress, which might decrease the life...that's the only reason why I was asking.