I've got some ideas, but man, it would be a major fabrication process. I've got some Harley CVO 4" can pipes. I have had a pair apart before and the pipes inside could be used to replace the stock piping. But by the time you got through, I'm not sure it would be worth it?
What about the TOR pipes. Has anyone ever cut one of them open? The pictures the other member showed were stock pipes right?