I don't have the fulsac, nor do I have a sound clip of my exhaust at cruising speed. But I will try to do that. When I bought my cvo ultra I talked to the owner of the dealership, this is a hands on guy, works there 7 days a week, and is always accessible. I told him I wanted the deep, low rumble that sounded like a harley but still hear the stereo at cruising speeds. He suggested the S&S power tune dual header pipes. Even my dyno guy agreed. They are the best fitment for the harley and they create a nice sound. I went with the Vance & Hines monster rounds as one of their suggested slip ons. There are no you tube videos of these together, but they are sweet. Nice low deep rumble, they can bark when I roll on it hard, but I can hear the stereo well. I may have to bump up the sound a notch or two here and there but they work well together and no problems after long rides.
I have a clip here on this site but that was before I got it dyno'd. I'll do another sound clip soon now that it has been dyno'd. And maybe I can get one at cruising speeds