I would like to see a cutaway drawing showing what is beneath. Looks like there is a seam. Looks like screw heads may are sticking down on the bottom of it. I believe it is two parts consisting of the body and the cover. The exhaust pipe must be replaceable and the only way I can see this happening is to remove the cover, replace the exhaust pipe, and reinstall the cover.
(I first typed "I would like to see what is inside that big bulge," Then I stopped and thought to myself: No, not with this crowd, I don't dare type that!)
(I first typed "I would like to see what is inside that big bulge," Then I stopped and thought to myself: No, not with this crowd, I don't dare type that!)