O2 Oxygen extension universal HYDROGEN spacer HHO gas M18 X 1.5 18mm size thread

This is (1) O2 sensor adapter / extender 18mm thread size for sale
This 50mm CURVED long gas saving extender works by moving the sensor further away from the exhaust flow by installing it with your rear o2 sensor, the sensor and ecu would think it is still the correct flow amount, perfect for owner who is running test pipe hi flow cat or straight pipe.