Going to end up keeping my 04 for a while now and have been thinking about changing exhaust. I like the idea behind the muffler, quiet until you get on it just wanted to know if it works as good as advertised.
I found a 3" mandrel bent stainless cat back on summit for $330 with a nice looking tip so I figured for that if I hate the muffler I can get something else and still be sitting pretty good price wise.
I also have a dynomax ultraflow. I have a 14" with single 3" inlet/outlet. Even on my HCI 4.8 with longtubes/ORY, it's very quiet when cruising and growls when I get on it. I love it