So, I just swapped out my stock exhaust with the "New Quieter" GSE exhaust on my 2015 sportsman 570. I ordered the package deal direct from GSE that included the performance air filter (similar to K&N), but note it does not come pre-oiled or with any oil.
It took roughly 20 min to swap the exhausts out.
Here’s a link to the audio comparison:

So far so good, I can’t wait to take it out on the trails.