Power Commander III. It's a small computer that plugs into your FI system. It adjusts air/fuel mixture across the entire rpm range more precisely than the ECU on the bike. The ECU stays on, the PCIII is in addition to. There are maps available for just about any combination of performance mods you can think of.
Given the incredible amount of discussion in horrendous detail about all sorts of settings, you have no idea of how refreshing and fun it is to see a question like "what's a pciii"?
Trust me, I'm laughing with you, not at you :^)
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