My son has a re-geared R6 and we often line em up for sh*ts and giggles. I have him out of the hole and until I shift to 3rd. On the Busa I just run away from him, plane and simple. There's no way even a turbo'd 9 could beat a Busa even out of the hole. That is if the Busa rider has any idea what he's doin.
I owned a bone stock M109R and CHEWED UP and completely humiliated an R6 off the line and for about 2-3 city blocks.
I would think a turbo'd 109 with the right rider, and a 'Busa with the "not-so-right" rider, would win..
Especially a "drag race" too many factors involved, most importantly the rider..