FWIW this is my tune on a 2016 5.7, M6, shaker.
Long tube headers, catless mids, 3" flowmaster full system with super 44's, Holly sniper intake , stock TB, stock cam.
Engine pulls hard to 6800 rpm
Car is in garage for winter upgrades.
Cam, and valvertrain components, head work, 90mm TB.
Wanted to get close before can and other upgrades.
Runs very strong as is and makes stock scats wish they had not tried LOL
Maybe this will help someone in there tuning