I am honestly not qualified to put them on that kind of a scale, sorry. I rode with them some more today and I am getting where I like them, quite a lot actually.
They are considerably louder than factory, not quite "that guy" loud, but still loud enough for me to be a little unsettled in my quiet neighborhood firing up the bike really late or really early in the morning.
If you force me to put them on the scale, with the bike off as 0, factory at about 3, and "that guy who competes in the loudest pipes competition" at 10, I would say somewhere around a 7 at a stoplight, 6 or 5 going down the road. Remember that these have the quiet baffles in them directly from Dean Speed.
Another way to look at it, if you have seen the show Sons of Anarchy, this bike would fit right in