I just bought a used 2006 1300C, and the guy who sold it to me has a bunch of add-ons included. (GREAT GUY, AWESOME DEAL!) I just got home for some R&R to try it out, and I don't know if the pipes are stock. I've compared them to other pictures of stock pipes, and the center hole in mine seems to be larger in diameter, also, the the little stubby pipe coming out only goes in maybe 1/2" and then ends where the stockers look like it goes all the way into the first baffle. It rumbles REALLY deep and mean, but that's it. There's no loudness when on the throttle, no real bark. I love the sound, but want more volume, and if these are aftermarket pipes, I'm afraid to do the clayton mod to them. Some advice would be appreciated.