Re: Well I just had to say this and see if anyone else has experienced this
I think you might have yourself a really good home-made pipe there, if even an expansion chamber can't sell it short. I think if you continued tweeking it you'd come out with something pretty well-suited to your specific bike. If you've made good use of your knowledge and experience with that bike, then you may not find many aftermarket parts that'll make a WHOLE LOT of difference over what you can do yourself.
"There is nothing wrong with wanting a motorbike that is an extension of your personal taste and fashion sense; if you must ride somewhere, I say do it with style