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Hey guys I'm sorry for beating a dead horse here but I need some help. And to start, ill say that I have been researching. I've read every thread I can find and got some useful info but I'm looking for a solid definite answer and hoping someone can help.

I just bought a 2005 Nissan Titan SE 4x4 on Friday and loving the truck so far. . . . BUT I have a cracked exhaust manifold from what I can tell on the drivers side.

I would just do headers with no cats no biggie but I live in Cali. So it has to be legit. I have read that I can do JBA Shorties and weld cats onto those but have read this will destroy the stock cat and can suck it back into the motor causing it to fail. Also read that high flow cats cause a lean condition which could create more issues.

The other option I'm seriously considering, is having my brother who is a welder by trade drill a hole on each side of the crack and weld them up. Has anyone done this with lasting results? I worry about doing all the work and having them crack again or in another spot.

again sorry for making yet another thread on manifolds but I just cant seem to find the info I need. Thanks in advance :cheers:
 

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Welding the factory cat to the header will not cause the cat to fail.
 

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Welding the factory cat to the header will not cause the cat to fail.
That's what I'm hoping to hear. Have you had success with doing this? I have read of people having issues with the stock cats failing after doing headers this way and ending up with detrimental affects when debris gets sucked back into the engine. have you heard of that happening?
 

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Stock cats fail when they are already close to end of life.
Sparks automotive. In Santee, California welds up this deal all the time. So do some others. People who have done it are very happy. You will need a tune. Call Cajun.
Do what he says. Drive. Have tons of fun. Pass smog no problem.
 

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The best thing you can do is the shorties and high flow cats. I honestly dont think salvaging the stock cats to weld onto the new shorties is worth it. However, if your looking for the cheapest simplist fix, you gotta do what you gotta do. As far as the lean condition, every truck is different, and 99% of people who put headers on, either long or short tube, will require Uprev. But with the stock cats and shorties may be OK. I know it sounds complicated but it is very painless and worth it.

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Stock cats fail when they are already close to end of life.
Sparks automotive. In Santee, California welds up this deal all the time. So do some others. People who have done it are very happy. You will need a tune. Call Cajun.
Do what he says. Drive. Have tons of fun. Pass smog no problem.

Sweet! thanks for the lead, I'll call Cajun and see what he recommends. You're the first I've heard that says ill need a tune with JBA and stock cat welded to it. Why would it need a tune and is uprev the only option?
 

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Where in California are you located? There is a shop, FMS Performance in San Bernardino that will do the whole setup with new headers, cats and full documentation.
 

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The best thing you can do is the shorties and high flow cats. I honestly dont think salvaging the stock cats to weld onto the new shorties is worth it. However, if your looking for the cheapest simplist fix, you gotta do what you gotta do. As far as the lean condition, every truck is different, and 99% of people who put headers on, either long or short tube, will require Uprev. But with the stock cats and shorties may be OK. I know it sounds complicated but it is very painless and worth it.

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Thanks for the advice. I just don't want to go through and have to run headers, high flow cats and antifoulers for the o2 sensors to not throw a code. plus add in uprev and it gets really pricy to do that.
 

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Thanks for the advice. I just don't want to go through and have to run headers, high flow cats and antifoulers for the o2 sensors to not throw a code. plus add in uprev and it gets really pricy to do that.
Just remember, the stock cats commonly fail and can cause engine failure in some situations. I don't think you need antifoulers for that setup.

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Just remember, the stock cats commonly fail and can cause engine failure in some situations. I don't think you need antifoulers for that setup.

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Ive read that a few times and that's my fear with stock cats. With high flow I wouldn't need to space the O2 sensor out of the stream to not get a code? Also to clarify with doing high flow I do have to do Uprev correct
 

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Again, every truck is different. You would at least need to have your air to fuel ratio checked to be sure. Some run longtubes without a tune and are fine. But better safe than sorry. I'm pretty sure your O2 sensors would be fine as long as you have cats. Maybe an extended bung is necessary? Someone else will have to confirm that.

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That's what I'm hoping to hear. Have you had success with doing this? I have read of people having issues with the stock cats failing after doing headers this way and ending up with detrimental affects when debris gets sucked back into the engine. have you heard of that happening?
As I understand it, it's the cracked manifolds that makes the cats overheat and fail.
 

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The stock cats have a screen between them and the manifolds is that right?
I don't know if there is one. Hopefully someone here on TT has info on that. However, as long as you have leak free headers and good O2 sensors, there shouldn't be anything messing up the cats. Well, unless they are hit by a rock or something. Just have the AFRs checked and preferably Uprev it.
 
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