Upgrade kit Without O2 sensor Allows the factory ECM to interpret and use wideband o2 sensor signals Target fuel table from the calibration is achieved in real time Retains OEM closed loop and achieves adaptive fuel control strategy Learns and uses VE table corrections as you ride Does not interfere with dealer diagnostic/ service tools Includes OEM style connectors to plug into factory o2 harness, either 2 or 4 pin versions