VTT - Thermo-Isolating O2 BungsPrice is for one bung Tired of burning out O2 sensors on your pre turbo O2 installation such as BMW N54 etc? Well, now you do not have to. Our Thermo Isolating O2 bungs either screw into your existing O2 bung, or weld into manifold or header. These bungs then isolate the O2 from the direct heat a pre turbo sensor sees. They do this by reducing the exhaust gases flowing over the sensor, as well are lift the element away from the hot manifold with 8