Built-in M18X1.5 catalytic converter, helps to prevent check engine lights. General model is suitable for most automobiles. Built-in mini catalytic converter, helps avoid check engine lights after exhaust modifications or removal of the catalytic converter. Do not use extensions as they may not function properly. This is a genuine mini catalytic converter. Helps the ECU detect that a catalytic converter is still installed, preventing error codes related to higher temperatures and unburned fuel flow. Size: Hexagonal 22 mm, length 55 mm. Inner diameter thread M18x1.5 Color: Silver Material: Stainless steel Package Contents: 1 x Sensor Only the above package content, other products are not included. Note: Light and display settings may cause slight color differences between the image and the actual item. Measurement allows an error of +/- 1-3 cm.