Dealerships, Ebay, or a Forum hook-up for the color change in plastics.
A Buell Race Kit is a Buell Race Pipe (Muffler), Buell High Flow Air Filter (similar to K&N), and a Buell Race ECM programmed to match the formers. (A full Race Kit is fairly hard)
Ceramic HEADERS are beautiful and effective.
As far as HP, I'm not sure. [smirk]