I had my 5.3 tuned by black bear. When he was reading my stock tune, he told me that the computer was making up for the motor knocking most of the time it was running. He told me to run the higher octane. He said my 5.3 (2011) was a little higher compression then GM claimed it to be. I know that's a 5.3 but the but I think higher octane is always better in a gas motor.
You got to show us some better pixs. of that beast! That is sweet! Looks like one of those new black out editions ? What do you have for lift and tires?
If you go on their web site(you can find a link on this site) you find a list of where the next meet is going to be, sign up and meet Justin in person for a tune. Or you can buy an auto-cal. You plug it in to your truck and drive with it and record data, send the data to Justin and will e-mail you a tune to log in to your truck. You can e-mail him or post a thread on this site and he will help you out.
Just tried looking it up on their web site. They only make the whole kit with a new box for 2014s. They do have a u-build it kit. You can make you own custom tube.
Come on in, the water is fine. I have a Black Bear custom tune. Best money you will ever spend on your truck. Justin keeps a copy of your stock tune and you load it back on any time you want, like if you needed warranty work.