The male connector threads into existing M18 x 1.5 O2 bungs, bolts on, no cutting or modification of original wiring like an electronic CEL FIX / MIL eliminator. Installation: This oxygen sensor restrictor should NOT be installed with the primary oxygen sensor (the sensor before the catalytic converter), quick and easy installation without modifications. Application: This oxygen sensor restrictor CEL Fix/Fouler with adjustable gas flow inserts. (Check engine light), for off-road race/track use only, prevent the CEL (CHECK ENGINE LIGHT) / MIL (MALFUNCTION INDICATOR LAMP) from illuminating when removing the original catalytic converter. When installing a high-flow catalytic converter on your car or truck, your engine light (CEL) may illuminate due to an increase in airflow. An oxygen sensor spacer separates the rear oxygen sensor from the exhaust path. An extension spacer only minimizes the risk of CEL. Some vehicles need their ECU reset if the CEL is triggered in advance. This product will work on your specific application. This kit allows for a correct and customizable installation position. Our oxygen sensor extension 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 correct sensor readings. Brand new condition. Fits all M18x1.5 threaded oxygen sensors. Durable corrosion-resistant plating. Fits all vehicles and exhaust systems with M18 x 1.5 oxygen sensor holes. For use of the vehicle's spark plug spacer to eliminate the engine light. Easy installation: Straight bolt-on, no modification needed. Very easy to install. color: Silver Material: iron size: 22 * 32mm Package contents: 4 * oxygen sensor bung Only the above package content, other products are not included. Note: Light shooting 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.