After trading in my 2017 ZL1 for the 2019 6.2, there was no way I was going 5.3. I added the Borla cat back and adds 15hp to the L87 6.2lL. You can tell the difference in bump of extra hp. The L87 is supposed to have 425 and the L86 420 HP, but the L87 has 10 less TQ. So that would make it right at 440HP in my truck and you can really feel the difference as compared to the 5.3 I drove.
Plus it is the best engine out there....
https://media.chevrolet.com/media/us/en/chevrolet/home.detail.html/content/Pages/news/us/en/2018/dec/1213-engine.html
425hp
https://www.tfltruck.com/2018/04/49203/