The HiPoTek O2 sensor holster may be used to secure an O2 sensor outside of the exhaust system when desired.  For instance, this allows for the removal of the catalytic converter for racing purposes, while still maintaining a functioning post cat O2 sensor as far as the ECU/PCM is concerned. The O2 sensor holster can be mounted in many places, and most conveniently within the frame rail.  It is a clean and effective method of securing a functioning and heated O2 sensor, which will protect the sensor from the elements and track debris.  The HiPoTek O2 sensor holster is a clean and secure alternative to the practice of wrapping the sensor in aluminum foil, within a baggie, that is zip tied to the frame.  For off road use only.  (O2 sensor not included.)