Question: Headers and O2 sensor.

[Straight Success]

I have noticed that many of the headers that I have been looking at with the down pipe and cat, have no place for the oxygen sensor. Some actually have a place for it, but it seems to be closed or sealed off. Can someone please explain why this is?

[wed3k]

DX and LX have the O2 at the header.
EX has the O2 at the downpipe.

[Straight Success]

Correct. However the 'down pipes' on most of the headers (one sold as a set) have no spot for the 02 sensor. Now I'm thinking, do I just buy the header and keep the stock down pipe?

[wed3k]

no, you buy one for an EX.

[Straight Success]

Straight.

[wed3k]

im not sure what that means but i know they make different style ones. my DC sports has a different down pipe and collector flange. The ex's had different flanges which is kinda garbage when you go try and buy a bolt on cat.

[nine_deuce]

If you look at them, there is usually a bolt they thread in there from the manufacturer. Perhaps as to not mess up the threads, I'm not sure. But, they normally have the o2 sensor bung in either the header or the down pipe.

Post some pics of the headers you're talking about?

[Straight Success]

That means I understand. I have some headers that I designed on CAD, but I'm not sure if they will work. They are to the correct specs though. I inquired about pricing to get them made, and it was close to $600. At least that was the estimate. I should get another quote.

[wed3k]

That means I understand. I have some headers that I designed on CAD, but I'm not sure if they will work. They are to the correct specs though. I inquired about pricing to get them made, and it was close to $600. At least that was the estimate. I should get another quote.

you should. you have dimensions on the tubing and stuff?

[Straight Success]

Yup. Everything down to the placement holes for the block is where they need to be. I don't know how they would allow the block to breathe. 2.25" is all the piping from the block to the cat. I could eaisly change it to 2.5" if I wanted.

[js593]

no, you buy one for an EX.

I tried bolting up an aftermarket header, on a stock downpipe. It doenst work. the flanges are the same, however they are on different angles.

[Straight Success]

I tried bolting up an aftermarket header, on a stock downpipe. It doenst work. the flanges are the same, however they are on different angles.

OK. Thanks for that information.