The Honda VTX1800 comes with an oxygen sensor in the O.E. pipe, for
bikes built for the California market. Cobra pipes for the VTX do not
use the oxygen sensor. An adaptor that fits on the wiring to the sensor is
available, which eliminates the need for the sensor.
NOTE: All VTX bikes in California must have this sensor
eliminator if using Cobra VTX pipes.
NOTE: Check state and local laws before purchase.