Just an update:
I'm using the Diablo Tune with great results. Shell 93 octane fuel with a bottle of Lucas on every fill.
I disabled the AFM and Torque Management. Increased my throttle response to the maximum 20%. Changed the transmission to Firm Shift. Those are the only things I changed myself ...

ordered!

Awesome! Thank you.

So I'm looking at buying a tuner for my 2015 GMC Sierra 4.3L V6. The new Intune i3 does not support disabling the AFM on the V6 but does on the V8. If I purchase the Sprint Module, will it work in tandem with the i3?
I was told on other forums that I could purchase the older i1000 and it will ...