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  #13  
Old 05-16-2010, 11:58 PM
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Re: Removing catalytic converter

For future reference:

As long as the O2s located downstream of the cats are not reading too much oxygen, they will not "wig out" . Either they need to be spaced away from the piping with anti-foulers , or relocated downstream, etc etc. Sometimes they need no mods at all....it is a luck of the draw.

These systems are not rocket science, its just a matter of understanding what it takes to get what you want, all the while allowing the systems to work uninterrupted.
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Old 05-17-2010, 12:01 AM
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Re: Removing catalytic converter

ya that i understand. I was just wondering if this is a project i can do before i go to work. I dont need it half apart because I cant seperate the cats from the headers
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  #15  
Old 05-17-2010, 12:38 AM
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Re: Removing catalytic converter

Quote:
Originally Posted by caa0428 View Post
ya that i understand. I was just wondering if this is a project i can do before i go to work. I dont need it half apart because I cant seperate the cats from the headers
What are you trying to do? Header install? Removing the cats?

The short answer to your question is no.
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Old 05-17-2010, 12:39 AM
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Re: Removing catalytic converter

Just remove cats
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  #17  
Old 05-17-2010, 12:47 AM
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Re: Removing catalytic converter

Quote:
Originally Posted by caa0428 View Post
Just remove cats
And what do you plan on putting in its place? Do you have a downpipe ready to bolt in? Again, do not attempt this if time is critical.
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Old 05-17-2010, 08:34 AM
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Re: Removing catalytic converter

okay so this is a weekend job. i dont have a downpipe ready to go. i was goin to cut out the two pre cats and put in pipes but it looks like a tight fit. with the flange and o2 sensors in the way
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Old 05-18-2010, 10:40 PM
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Re: Removing catalytic converter

it indeed is a tight cut just do as good as you can, cut right on the weld for the cat, clean everything up and weld some pipe in there. should take you the better part of a day. the bolts for the passenger side downpipe are a pain youll see what i mean
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Old 05-18-2010, 10:50 PM
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Re: Removing catalytic converter

well i decided to cheat a little bit i bought a pair of cat free down pipes from and 01 just have to weld in the nut for the second o2 sensor
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  #21  
Old 05-29-2010, 11:13 PM
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Re: Removing catalytic converter

any recommendations on a good handheld tuner for my 01 jeep?
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Old 05-29-2010, 11:21 PM
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Re: Removing catalytic converter

SCT or superchips
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  #23  
Old 05-29-2010, 11:33 PM
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Re: Removing catalytic converter

ok kewl!
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  #24  
Old 03-09-2012, 04:16 PM
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Re: Removing catalytic converter

I hate to revive an old thread, but after searching, this is what I found.

I have an 04 4.7HO Overland.
I recently had the front two cats replaced.
Same old O2 sensors put back in.

The other day the exhaust down from the "Y"pipe came off. The techs did not securely fasten the rest of the exhaust which contains a straight run of pipe, the 3rd cat and the muffler.
When the "Y" pipe fell off, I lost most of my low end torque immediately.
I was planning on replacing my 3rd cat with a straight run of pipe to free up some flow. (No emissions testing in my state). But once I realized how much torque I lost, I have changed my mind.
My question is, why did I lose this much torque? I thought that freeing up flow would increase performance. Does the 4.7 HO really need that much back pressure to operate or do I have something wrong?
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