Yamaha XV1900 Midnight Star Oxygen O2 Lambda sensor Eliminator Stratoliner Roadliner Cobra for exhausts that do not have the sensor holes The o2 sensor is an electronic sensor located inside the exhaust and is used to determine if the air to fuel ratio of an engine is rich or lean
The o2 sensors of the most motorcycles are limited to catch the emission standards and in some specific throttle situations will try to lean or richen the mixture to catch the stoichometric air/fuel ratio.
This is good for the emissions but not for the performance and smoothness of the engine
Disabling the o2 sensor you will gain a vastly improved throttle response and smoother power delivery because you will have more torque available in this specific situations
The oxygen sensor eliminator is also needed to support the FI mods like the Power Commander and it is compatible with all the FI mods
You can also use it to bypass a faulty oxygen sensor or to use an aftermarket exhaust that dont have a hole for oxygen sensor because it is the only way to bypass it without FI problems