ok Here I am
from what I have researched on my particular bike the Leo Vince SBK cans give the best scope for performance tuning, short of the expensive 4 into 1 modification, if your specifically chasing top end power.
I have always run without baffles, I have owned several different types of sportsbikes all with aftermarket exhausts, these particular cans are in no way excessively noisy, exactly the oppposite. I have had people tell me that its one of the nicest sounding gixxers they have heard.
Not being biased of course but when Tracey was riding mine on our recent trackday, it was the first time I have actually heard my bike running in anger from pit lane and it does sound sweeeeeeet
So I say performance and noise wise the Leo's are probably the best exhausts I have had. Only fault I have found with them is they are difficult to keep clean and are easily scratched.
Being European they have an extensive range for scooter exhausts, much more than the American based brands.
Being in NSW I would have thought any dealer should be able to get them for you. I managed to get them in Tassie.