The Touring mufflers have the saddlebag mounts welded to the top. Since they have no other mounting point, and the Roadster doesn't have the saddlebags, I doubt they'd work. And even if they did, those big mounting brackets would look out of place.
As to getting more noise out of the Rocket, its a pretty subjective thing. I have Jardines only for the power. I don't find the Rocket to be a very pleasant sounding motor and would prefer it be quieter rather than louder.
In my opinion just making more noise serves no useful purpose, but of course I could be wrong.