okay so im going to sound like a complete idiot who doesnt know anything about cars but i was looking at a header/dp combination and i noticed 2 bungs, one in the header and one in the downpipe, i know i have a stock o2 sensor coming out the header but do i also have one in the downpipe?? or is the 2nd bung in the DP for a wideband?

 

You've got two 02 sensors. One in the header, one in the downpipe behind the catalytic converter.

 

you could look under your car....

you have one on the down pipe (down stream) and one on the exhuast manifold

 

the one on bottom is hard to see from just looking under the car. you need to get under it to see it well.

 

well dont strain yourself

 

alright. so if u hook up a wide band you need to have 3 total bungs? where do you put the bung in for the wideband? im lookin at some aftermarket headers and downpipes right now to go with my catback.

 

Put it on the dp somewhere. Some companies you can order it to have an extra bung welded for your wideband of your could take it to any auto shop and they should be able to cut a hole and weld the bung on for you where you wanted.

 

Make sure the wideband bung is IN FRONT of your catalytic converter or you're gonna get a fucked up AFR...

 

the DP im lookin at is catless, so does it matter where it goes?

 

no you're fine that actually makes it easier lol but personally i wouldnt go catless man i made that mistake and will never happen again on a NA cobalt. makes the car sound like ****. High raspy sound. AND WAY TO LOUD. If you had a tc or sc car it would be different, so ive heard.

 

alright ill stick to catted then. catted is about 60$ cheaper anyways. probably gonna just get a highflow cat then. thanks flyy, and one day i will be boosted