I bought lsj headers and put em on 2.2 last night. There's an o2 sensor bung on the headers. I have 3 o2 sensor bungs so I need to cap off one. But I need to know whether to cap off the one on the headers or cap off the one of the downpipe above the catalytic converter. I can get it retuned if need be.

And I still have the factory downpipe. Jus FYI

 

you still got the downstream o2 right? if so just cap off the pre-cat one and use the one on the header

 

cap the one on the downpipe itself right before the cat... trhen buy a wideband and make use of that extra bung lmao