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Exhaust Size after the 4th Catalytic Converter

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Old Jul 17, 2007
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Exhaust Size after the 4th Catalytic Converter
I want to know what the OD of the Exhaust pipe is after the 4th Catalytic converter before the flange.

I was thinking it was 2.5" can anyone confirm this?
 
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Old Jul 17, 2007
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I just put calipers on my exhaust yesterday because im replacing that pipe on re-doing the exhaust again. And i came up with 2.5"
 
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Old Jul 17, 2007
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Yeah I am pretty sure its 2.5
I want to get my exhaust redone. I just want a little more of a note then what i has now.
 
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Old Jul 17, 2007
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From: Havre De Grace,Md
Originally Posted by zabeard
Yeah I am pretty sure its 2.5
I want to get my exhaust redone. I just want a little more of a note then what i has now.
Than again you have a new ranger. They could and should still be the same exhaust sizes........idk
 
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Old Jul 17, 2007
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2003 4.0L is 2.5" out of the cat but necks down to 2.25" right before the flange.
 
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Old Jul 17, 2007
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Originally Posted by rwenzing
2003 4.0L is 2.5" out of the cat but necks down to 2.25" right before the flange.

cool, thanks Bob.

I want to get rid of that drop down in size.
 
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Old Jul 17, 2007
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another exhaust? #4 or 5 for you aint it
 
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Old Jul 17, 2007
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Did you ever think about cutting out that 4th cat? Thats what I am thinking for when I do mine.
 
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Old Jul 17, 2007
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I have thought about it but I dont know if i want to.
 
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Old Jul 17, 2007
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Originally Posted by DerangedPony
Did you ever think about cutting out that 4th cat? Thats what I am thinking for when I do mine.
I wonder if that will be emission leagal for me..................
 
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Old Jul 17, 2007
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What are the pros and cons of removing the 4th cat. Mostly interesed in the cons. Dont want to mess anything up.

What exhuast are you going with Zach?
 
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Old Jul 17, 2007
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Originally Posted by ranger
another exhaust? #4 or 5 for you aint it

1.stock
2.magnaflow
3.flowmaster
4.borla
5.(what i am thinking now)

looks like number 5 if i do it.
 
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Old Jul 17, 2007
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Originally Posted by Lord Of War
What are the pros and cons of removing the 4th cat. Mostly interesed in the cons. Dont want to mess anything up.

i have no idea. i am not really looking to remove it.
 
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Old Jul 17, 2007
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Do you guys have your o2 sensor after that last cat? Mine was "Removed" and I haven't had any problems at all. It actually sounds better, but that was it....
 
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Old Jul 17, 2007
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01-03 has a sensor between cat 3 and cat 4

04+ trucks only have 3 cats as far as i know.
 
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Old Jul 17, 2007
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Originally Posted by greygooseranger
Do you guys have your o2 sensor after that last cat? Mine was "Removed" and I haven't had any problems at all. It actually sounds better, but that was it....
2003 4.0 has the CMS O2 sensor in the short pipe between the 3rd and 4th cat.
 
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Old Jul 17, 2007
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Mine on an 04 was 2.5" till the last cat, then leaving the last cat it went to 2" and then to 2.25" with a 2.5" tip. I just cut off all the pipe after the cat and went 2.5" all the way through.
 
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Old Jul 17, 2007
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Originally Posted by rwenzing
2003 4.0 has the CMS O2 sensor in the short pipe between the 3rd and 4th cat.

Hmmmm, I have a 03 FX4 and I do not that I have one there. I'll have to look, it gives me a reason to get away from my desk.

edit: damn, it's there.
 
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Old Jul 17, 2007
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4th cat..

heck i just thought i had one..lol where the other 3 at?
 
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Old Jul 17, 2007
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Originally Posted by HighRollerII
4th cat..

heck i just thought i had one..lol where the other 3 at?
you have a 04, so you only have 3. After each manifold, there is one small cat and then the large one that the two pipes feed into. The 03s and below have another one after your third cat.
 
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Old Jul 17, 2007
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You're 2004 has 3 like mine did, I removed my last one, so now I only have....2. Shhhhh....
 
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Old Jul 17, 2007
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Originally Posted by Lord Of War
What are the pros and cons of removing the 4th cat. Mostly interesed in the cons. Dont want to mess anything up.
I dont see why there would be any Cons. Basically, you will have the same set-up of a 2004-up truck after you remove the 4th cat? The o2 is before the 4th cat so I see no reason why it would not pass emissions.
 
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Old Jul 17, 2007
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Originally Posted by DerangedPony
you have a 04, so you only have 3. After each manifold, there is one small cat and then the large one that the two pipes feed into. The 03s and below have another one after your third cat.

oh i c..didnt know that..well i learned my new info for the day
 
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Old Jul 17, 2007
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Originally Posted by DerangedPony
I dont see why there would be any Cons. Basically, you will have the same set-up of a 2004-up truck after you remove the 4th cat? The o2 is before the 4th cat so I see no reason why it would not pass emissions.

Ford felt generous and gave the 01-03 guys and extra incase the others failed
 
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Old Jul 17, 2007
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yea another one to get clogged
 
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