I have a yyellow box on my busa and no problems. I don't know if this is a problem that a busa would ever encounter, but a friend of mine whom i helped to install a speedohealer on his '04 R1 has had odd problems with the thing freaking out mid-ride and displaying no speed at all. We are pretty sure that it is heat-related, because the SH is under his seat and it gets really hot under there with the exhaust. On hot days is when it seems to freak out, and after it cools it is fine. Again, I don't think that a busa would encounter this, nor do I know if a yellow box would fix it. I have a speedo healer on my '02 GSXR 600, but I just thought I would mention it because I know lots of people here have more than one bike.