Got my 06 Dyna with the Thunderheader already on it. It has heat shields on it as well. I love the sound of them, but as Glider pointed out they have discolored for me. Now I got mine used and was told it was garage kept (and was when I visited it and picked it up), so I can't be 100% user it did not spend some good time in the wet, but not likely. Anyway they have discolored from that nice black to the point where I am considering either sending them away for a fresh ceramic coating, or replacing them all together. I think there are better looking 2-1 exhausts and would love to see Thunderheader actually stand behind the color problems with the exhaust, which they do not, to date they have been unresponsive.