I have the Triumph Carbon Fiber Can on my 00 RS. Besides looking really trick, it does improve the sound with out being obnoxious. It has such a wonderful growl under accleration that I find myself rolling off the throttle while cruising, just so I can roll back on to hear that wonderful triple song!
Interesting note however, a friend has an 01 RS and had the carbon can installed at a different dealer, and it is a slightly different pipe than mine. His is a 2 piece design with the exhaust pipe bolted into the can. Mine, the pipe is welded. I believe there are two pipes available, one for the earlier 108hp motor and another for the later 118hp motor. My dealer claims that mine was the correct one for the 00 & 01. His dealer probably put on what they had in stock and didn't check. He has not noticed any running problems with that can and the proper downloaded tune, and it is even a bit richer in sound. I personally think his looks better as well. that is the one I would go for.
Good Luck!
Rick