Thanks for the link .. I did look but couldn't find it.
This is very similar to what I have sketched for my bike.
I am thinking of making the pipes a little more squared off to suit the angular look of the bike... very similar though..
You may want to pull of the stock mufflers and take a run down the street before you make tips. I did so and had a headache in short order. you will want some sort of muffling device....I do love the look of the mufflerless system, just not to practical for actually riding the bike.