has anyone used the O2 sensor spacer. does it work is it worth it

 

i wish i knew what you were talking about

u mean a heatsink to keep the sensor cooler?

 

there is an o2 sensor after or in the cat/test pipe. in order to stop a check engine light from occuring due to a test pipe there is a spacer that can be purchased or made to space the sensor out of direct current of exhaust flow.

 

never heard of that... what you should do is wire up just one o2 sensor but run some resistors off to the other connector on the ecu so it thinks the cat is working properly.. diy ftw