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Old 01-28-2017, 04:27 PM   #1
jamx13
 
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Default 02 Frontier KA24DE exhaust header

I've read thru some of the questions on the forum & know this has been discussed before, but I need some clarification & verification that I'm on the right track. 1st the setup...

I have an 02 Frontier XE, 2WD King cab, 2.4L, auto. I live in the NY rust belt where the roads are heavily salted over the winter months, meaning it's nearly impossible to unbolt stuff without breaking something or at least a major struggle. The exhaust system was replaced a few years ago by the previous owner from the cat back using stock parts. It's been getting loud so I crawled underneath expecting the leak to be at one of the flange connections. I grabbed the pipe to help re-position myself & my finger poked thru the side of the pipe. It turned out to be the downtube coming off the pre-cat. Replacements at rockauto start at $180.



My plan is to remove the stock exhaust manifold w/precat & replace it with one of the eBay stainless headers for the 240SX S14. Like this:



I understand I'll have to fabricate a piece to tie in between the collector & the converter. Chances are I may have to replace the converter. If I do, I'll use a free-flow universal for ODB II. I'm guessing I might have to weld a bung for the O2 sensor to the pipe behind the cat or possibly get a cat with the bung already in place. I might even upsize the entire system.



Basically what I'm asking is, am I on the right track? Will the upstream O2 sensor in the header & the downstream sensor behind the cat work properly so that it doesn't throw a code?

Suggestions appreciated. Thanks!

Last edited by jamx13; 01-28-2017 at 04:28 PM. Reason: spelling
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Old 02-01-2017, 03:59 AM   #2
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No comments? Does that mean I got it right?
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Old 02-01-2017, 10:51 AM   #3
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That is how the stock configuration is set up.

If you are replacing it with a similar stock setup, I would not think you should have any codes to worry about.
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Old 03-12-2017, 04:47 AM   #4
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Quote:
Originally Posted by jp2code View Post
That is how the stock configuration is set up. If you are replacing it with a similar stock setup, I would not think you should have any codes to worry about.
It's not exactly the same as the stock setup because I'll be eliminating the pre-cat. As I understand it, since the pre-cat is much closer to the engine, it heats up quickly & helps reduce emissions until the main cat reaches full operating temp. I don't know if the ECM is sensitive enough to detect the difference without the pre-cat.
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Old 03-12-2017, 05:34 AM   #5
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You have to be careful in NY they only allow certain catalytic converters, similar to what is used in CA.
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Old 03-13-2017, 02:19 AM   #6
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Originally Posted by ahardb0dy View Post
You have to be careful in NY they only allow certain catalytic converters, similar to what is used in CA.
I know, that's why I'm being cautious & asking questions. I may just install the header, tie it into the existing exhaust & be done with it. Thanks.
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