03-06 HONDA CBR600RR: Dynojet Power Commander O2 Optimizer (Type 1 Basic o2 Optimizer / 76423005) The system is designed to read the oxygen sensor under certain conditions and temporarily change the air / fuel ratio. Optional high-performance oxygen sensor optimizer for easier adjustments through the Dynojet control center software. Use with the Power Commander III USB or Power Commander III USB EX. Note: With some motorcycles you have to disconnect the O2 sensor cable so that the engine electronics accept the revised values from Power Commander III USB and the performance can be increased. The O.E.M.