I was planning on buying a jdm **** 4-1 header for my crx w/b16 in it, but I am running obdo, and have 2 oxygen sensors. I also purchased a password test pipe with 2.5 collector. My question is, can I use this header, along with this test pipe, but relocate both o2 sensors at the collector of the header, and one in the test pipe with no problems? From what I read, you need both o2's for the engine to run properly, but I'm not sure if I relocate and extend these o2s I wont run into any issues. Has anyone did this before, or am I the first one to try? Thanks

 

you need both of them up by the head, get some bungs welded into 3 and 4 cylinder and put the o2s there. make sure you put the right one in the right cylinder tho, if you dont it will hesitate at steady cruise. if it does, just switch em..... or you could just convert to obd1. i did what you were talkin about and it didnt run good.

 

which sensor goes on cylinder 3 the one that comes with the harness or the one that you have to wire to the ecu plugs????????????????

 

really cant remember. just hook em up, and go down the highway, if your car feels like it hesitates and you can let off the gas and back and it clears up and does it again, switch em. when i redid mine i really wasnt sure which was which, just got lucky. my harness was all taped up in electrical tape and wire loom.