Titanium O2 Oxygen Sensor Plugs are ideal for adding a broadband O2 Oxygen Sensor to your titanium motorcycle or car exhaust. Ticon Industries O2 sensor plugs are CNC machined from the highest quality 6AL4V GR5 titanium alloy and are pre-assembled specifically for mounting 1.75″ – 2.5″ or 2.75″ to 6″ pipes for ease of use.