Dnt know my man- I'm trying to install a Yosh R77 on my 05 bike now. I've got a full Yosh TRS system. Hopefully I can use part of the full system to make the R77 fit. Its been done, I love the look of the R77 on the Gen I.
I worked this same mod on my 06, Gen1 header with Gen2 Yosh R-55. Not too many people pick up on it unless they are busa-freaks like us!