I have finally settled on a new exhaust slip-on for Raven. It has taken me 2 years now of looking and listening and searching in order to find something that looks good, is lower profile and the sound is deeper, but not much louder.
It adds a nice aesthetic and the sound is deep growling that never really whines no matter the RPM. And considering the NC700X is a low RPM motorcycle (Red-line at 6500) that means even at the top end, it is still growling along. While it is louder (I did not measure scientifically) it is not obnoxious or glass-shattering loud. I have been riding with it for a few weeks now, and love the sound.