AEM No-Weld O2 Sensor Mount for 1.75 to 2.0 inch Diameter Pipe - 30-2355-200AEM Electronics No Weld O2 sensor mounts enable users to mount a wideband O2 sensor without having to weld a sensor bung onto the exhaust. This is especially helpful for those that don't know how to weld or can't find someone that does. Simply drill a hole in the exhaust, install the gasket, and bolt the clamp. It's that easy!