I have a Dynoport Big Core Barker for sale for $75 plus shipping obo, it has a dent in it as the picture shows but it doesn't hurt performance. There is no damage to the internal perforated pipe which runs through the silencer. Its hard to notice the dent when the silencer is mounted, I didn't see it till it was loaded on a truck and I looked up at it. I'm just very picky about the appearence and so I decided to replace it. It probably could be taken apart and the dent pushed out.
