[franzn]

Im planning on upgrading the exhaust (header all the way back) on my car. (2002 qg18 as in the title) and I know Im going to have to figure out what to do with the two o2 plugs after the header, I know two of the plugs will go into the header I buy but what do I need to do with the other two? Im probably going to try to get the 2j side exhaust to see what its like on a 1.8.

 

[i68k]

normally you foul out the lower o2 sensors on a qr when you delete the cat, using the anti-foulers. not positive about the qg, do a search, many people have asked this question for the qg.

 

[franzn]

Im not deleting the cat. Im just trying to figure out where the o2 sensors not in the header go. Sorry if my wording was confusing before.