Oh and I cant speak from experience about debaffling the stock exhaust but I have very recently put on some cobra swepts (vulcan 900 custom).
These are much louder than the stock (which is almost dangerously quiet) and give a far deeper and more satisfying gurgle.
I am actually still coming to terms with the noise, which isnt too bad really, but leaving around six in the morning makes me wonder about the neighbours.
The aftermarket pipes are also much lighter and was put on by two chicks without much trouble so its pretty easy.