i was wanting a cheap alternative to buying an aftermarket pipe, but still wanted something diff. i got the idea of the undertail exhaust from a pic i saw in the "drz pic thread." the bike is an 05 with a stock 05 cbr rr exhaust. i also made my own carbon fiber endcap for it. i am still in the process of finishing the pipe, but this is what it looks like after a few hours of work. let me know what you think.