Many early fuel injection engines had some "hick-ups". See road tests of the early Honda RC51, Buell, etc. The August, 2001 issue of Motorcycle Consumer News cured the RC51's poor driveability with slip-on's and a Power Commander (remaps the engine control system). The pipes were $800, and the Dynojet $330. In some other issue, I remember they installed the same on a Buell and it added an incredible 20 HP.
If you have a driveability issue, stumbles, etc., the Dynojet may cure it. But the only problem I read with the busa is a fuel filter problem on the very early ones. :2cents: