Yeah. I am not even running a fairing and I can hardly hear it. I got the one that also attaches right into the stock mounting points like the OEM roof rack. I love it. I am also one of those weirdos who feels like a car just looks better with a rack.
I haven't gotten to drive enough miles with the exhaust for it to learn yet, but I am hoping that it will help with the mileage.
As much as the roads can be annoying some times (The joke goes there are two seasons in New Hampshire: Winter and Paving season) I do get to pass plenty and dip into the power.
I have been essentially trying to hypermile the poor thing and am pretty pleased with my results. I think the lack of a higher average has more to do with me and the roads than my car.