I like it, but I think you'd be better off going with one of the muffler's Joe used on his Ninja, just to save weight.... On such a little bike, weight is especially important, and since it's a whole nother can, you should try and make them as small as possible. try it out and see how it goes.
Would that make the bike quieter? The reason I ask is because I've noticed that the Gixxer 1000 and Hayabusa both have dual cans and they are whisper quiet (at low cruising speeds anyway) compared to, say, a 600. Would it be because they have two mufflers 'muffling' the exhaust sound instead of one, therefore making them twice as effective?