My 2021 is my 3rd 6.2, still only 2500 miles runs a bit better since I GM Accessories Borla Cat Back on.
My 2018 Max Tow was used as a workhorse for my retirement move from Michigan to Tennessee, really towed outstanding with many heavy loads. Free Truck, sold it for more than I paid for it.
My 2012 actually ran the best, great throttle response an great stock muffler sound.
Pics in post below.