Don't take a chance on using an extension that often does not work. This is a real mini catalytic converter built into the unit. This O2 sensor fix contains a miniature catalytic converter inside and helps resolve the check engine light commonly triggered after exhaust modifications or removal of the catalytic converter, including when installing a high-flow catalytic converter. These modifications can trigger check engine lights with error codes such as P0420 (Catalyst System Efficiency Below Threshold Bank 1) and/or P0430 (Catalyst System Efficiency Below Threshold Bank 2). CEL Fix Check Engine Light Eliminator Adapter - O2 Sensor for automotive use. . Type: O2 Oxygen Sensor Adapter Surface Treatment: Electro-nickel Plating Thread: M18x1.5 Length: 58mm Function: Check engine light correction Color: Silver Material: Metal Size: 58x16x25mm Package Contents: 1 x O2 Sensor Adapter Extender Note: The package includes only the items listed above. Other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.