I have a 93.5 G20. I am changing my catalytic converter with a cat from a 95 G20. On the 95, it looks like there is a O2 sensor connected to the cat. My 93.5 does not have the same sensor. Does anyone know if this is a O2 sensor or something else? Can I still use the 95 cat bypassing the sensor and using my O2 sensor? I definitely would appreciate any help with this.