When installing aftermarket headers and cat-back systems in your vehicle, the oxygen sensor is frequently relocated, usually far enough away from the original wiring location that the connector cannot reach. You cannot cut and splice oxygen sensor wiring since this can permanently damage the sensor and considerably reduce accuracy of the signal. These extensions are "Plug-And-Play" and utilize OEM connectors, terminals and seals with OEM wiring to maintain precisely accurate signals and safely extend the wiring connections. Note: Please check your connector shape and color to see if it matches your application.