lb7 or lly?
If you are talking about the lly with edge, there is a HUGE difference in power, much more. I'm sure it's pretty much the same for lb7. Yes it will recalibrate for your tires. It also reads dtc codes and resets them, removes top speed limiter.
If anyone comes up with a "evil tune" that I could use with my setup I will buy the efilive and the tune, and sell my ppe and maybe va 180.
Hope I was of help.