So I have a set of test pipes that just came in a few days and I am trying to install em. I am trying to find out which o2 sensors am I suppose to put into them?
upstream? downstream? part number for these o2 sensor will be a big help. the sensors that were on my oem cats are gone. So I am trying to find out which sensors I need to put in. are they before cats or after cats? downstream or upstream?

thanks in advance.

 

Don't know this for sure, but I would think they would be the same front and back. So a OEM aftermarket should work.

 

Upstream. The downstream go in the exhaust. Are you saying the the sensors are missing completely? There should be 4 total.

 

if u put aftermarket ones u need spacers for the sensors for dont get the check engine light

 

Keeps them out of the direct line of fire of the exhaust flow. They will crud up and give a false reading if spacers are not used.