Beautiful bike, I love the color. I look forward to your report on the sound. They make great stuff for cars, but I was unaware they offered pipes for bikes.
They have so many different sets it easy to mix them up! I did have the Hitmans on my 2017 SGS, a tad deeper but the knockouts may be a tad louder, they really woke up with my cam. I got the 4in knockouts for the same reason as you seem, to use the stock cvo muffler shields. Here is a clip of my 2019 cvo sg with the Knockouts.