Male end threads into existing x 1.5 O2 Bungs, Bolt-On, no cutting or modification of stock wiring like an electronic CEL FIX / Eliminator. Installation: This Oxygen Sensor restrictor is NOT to be installed with primary oxygen sensor (sensor before catalytic converter), Quick and Easy Installation with no modifications needed. Usage: This Oxygen Sensor restrictor CEL Fix/Fouler with adjustable gas flow inserts. (Check engine light),For off-road race/track only, prevent CEL (CHECK ENGINE LIGHT) / (MALFUNCTION INDICATOR LAMP) from illuminating when removing the stock catalytic converter. When installing a high flow catalytic converter on your car or truck your check engine light (CEL) may illuminate due to an increase in airflow. An oxygen sensor spacer spaces out the rear oxygen sensor from the path of exhaust gases. A extension spacer only minimize the chance of CEL. Some vehicles need their ECU reset if the CEL is triggered before hand. This product work on your specific application. This kit allows for a proper and customizable installation position. Our oxygen sensor extender kit is machine TIG welded for a precise fit. The threads have been precision cut for a proper seal to prevent exhaust leaks and maintain proper sensor readings. condition. Fits All M18x1.5 threaded Oxygen sensors. plating,. Fits All vehicles and exhaust systems with x 1.5 oxygen sensor holes. For Usage Of Vehicle Spark Plugs Spacer to check engine light. Easy Installation: Straight bolt-on, no modification needed. Very easy to install. colour:Silver Material:iron size:22 x 32mm Package Contents: 6 x oxygen sensor bung Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.