mb1604

when i get my new exhaust system where should i place the o2 sensors, im pretty sure the cat has a bung for one, but what about the other one?

supercow

new exhaust? so the headers and catback are going on at the same time?

one will be on the headers the other will need to be after the second cat. (you'll have to get a bung added for that) mines still in front of it though.... 02.gif

as long as there is one on either side of the cat it'll be good.

mb1604

yup, same time, what part of the header should the bung be? down by the collector? and the high flow cat im getting looks to have a bung right on that.. i cant use that?

CyberShark

You have the SSA header, right? You'll see the bung on the header it should be on one of the tubes around the middle of it. My cat did'n't come with a bung..I had to place one for the 02 sensor a few inches behind my cat..(my car only has one cat)

mb1604

no i dont have a header yet, still deciding on what kind, itll probably be between the obx 4-2-1 or the one on kspec depending on my job situation.

supercow

well with whatever header you get just check and see if it has one already.

btw, why does your sig say you have 4-2-1's going on soon when you don't have em. :

TibRacer01

Stock tibs have 2 cats and 2 o2 sensors. The 1st o2 is on the manifold and the 2nd is behind the 1st cat.

Your header should have a place to put the 1st 02 sensor. This needs to be close to the block. The 2nd o2 sensor will need to be behind a cat for it to read properly.

I am not sure about placing it on the cat itself, I wouldn't reccomend it.

CyberShark

Mb, you could remove your second cat if you want and just use the first..the second cat is only for California emissions (somehow these cars end up being sold in other states though)..

silvertibbs

I'm pretty sure that you HAVE to have it after the cat. It needs to read the changes that the cat makes.

TibRacer01

I was pretty sure about that, I just didn't what to tell him that he couldn't do it
unless I was 100% sure