At idle they produce a nice mellow rumble, and upon acceleration they become a bit louder but not overbearingly loud. Went for a ride for a hour today to test out the heritage bars. I believe my daughter took some video with her Iphone. I will see if I can post it. As compared to stock, more like what a Harley should sound like IMHO.
Thanks to all for the comments! Everyone of the rides I have seen here are fine lookin bikes, there's no doubt that there is a bike for everyone out there.