Thanks Ositech! Your directions and photos were perfect! The header and exhaust bolted up no problem. I had to mod some of the mounting holes on the left Unibiker radiator guard because the Yosh head pipe is a lot bigger than stock, but after that it also fit well, with about a quarter inch clearance, and the fan still mounted.
What are the differences between the Yoshimura full system S and E exhausts? I didn't realize there were two different models, and bought an E exhaust for my S. Will the E exhaust fit without to much modification?