The other day I was looking at an Urban w/ stock exhaust and wondered if anyone has ever mod'd one.
They look like they my be able to gutted from the rear (chop off the rear cap section), gut it and weld on a cone w/ a new & larger stinger. It could be a cheap mod and probably better than stock. Fab & welding could be done at a muffler shop after it's gutted. That would eliminate dealing with a header and pipe mounts.
The front cone is not ideal either and shoud be changed as well. So basically you'd be building a pipe around the center section, header and mounting system.