Yoshimura Signature or Street Series

[Batfink]

Depends on which year busa you have. From memory....
99-00 no to minimal flashing
01-03 minimal flashing
04-15 no need for 3rd party gizmo as fully programable

I could be wrong with the 01-03???
If you have a gen 2 with mode switch you can use that to have up to 6 maps available on bike... There is a wire or circuit you bridge via a wired in switch which turns A/B/C into D/E/F lol