I don't know what kind of pipes they are, but I guarantee you they aren't stock. I thought about asking the guy if I could trade for them before he puts it on the floor. They look like diesel stacks and they stick out past the hardbags. They have a very slight slash cut. Very good looking pipes.
There's a company that regularly parts out Rockets on Ebay. You should check their listings and see some of the prices they're charging for various components. I suspect you are right.