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Old 11-25-2011, 08:45 AM   #1
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Catalytic converter

Can i replace the converter with a straight pipe? I didn't see an oxygen sensor attacheted to it. If there is, i might just be blind...

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Old 11-25-2011, 09:15 AM   #2
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Check your state inspection laws first.

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Old 11-25-2011, 10:01 AM   #3
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Yes you have O2 sensors on the inlet and outlet sides of the cat.
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Old 11-25-2011, 11:10 AM   #4
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Quote:
Originally Posted by Neil F. View Post
Yes you have O2 sensors on the inlet and outlet sides of the cat.
Well... that depends on the year/engine.... I have 3 cats on my 04 I6. the two on the down pipe have O2's upstream and downstream, totaling 4.... the cat just before the muffler doesn't have any sensors at all.

If your smog Nazi's do a visual on your Jeep and find the CAT isn't there, they could turn you in for tampering... its all about the law.....
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Old 11-25-2011, 11:19 AM   #5
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Typically, there's a sensor right after the cat. You can straight pipe it, but prepare to address any local smog checks, check engine light, and other considerations I'm sure you will see posted soon.

I don't use a cat, fwiw.
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Old 11-25-2011, 01:44 PM   #6
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The ecu will throw a code unless you either modify the program or run something like an MEL eliminator in line. Re moving the cat can lower your low end torque on some engines. If your cat is just bad, I have had excellent luck with the Magnaflow cats. I use a 16" Magnaflow on my emissions pipe for street car. The car gets a 10/192 limit in the HC emission, with a small block Ford .577" lift cam and a 112 deg lobe seperation.

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Old 11-25-2011, 04:36 PM   #7
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To eliminate the CEL, just strap the rear o2 sensor to the outside of the exhaust pipe. Keep your front o2 sensor intact though.
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Old 11-27-2011, 12:26 AM   #8
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My 06 dosent have a sensor before or after the third cat. That being said, i replaced mine wed. because of a dent i had put in the stock one. Magnaflow High-flow cat 45 bucks on ebay. Part number was 94105 iirc.
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Old 11-27-2011, 09:33 AM   #9
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Thank you all for your input.
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Old 11-27-2011, 02:26 PM   #10
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I'm frustrated with my inability to understand what is and isn't a "high-flow" cat from magnaflow. I can only assume that the ones sold as "off-road only" are high-flow and all others are not high-flow. Am I thinking correctly or am I missing something?
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Old 11-27-2011, 02:31 PM   #11
Knows a couple things...

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Don't worry about high-flow cats, it won't make any difference. Besides, your engine was designed to work into some backpressure which from what I have read helps improve low-end torque.
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Old 11-27-2011, 03:44 PM   #12
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Quote:
Originally Posted by Jerry Bransford View Post
Don't worry about high-flow cats, it won't make any difference. Besides, your engine was designed to work into some backpressure which from what I have read helps improve low-end torque.
Good to know. So is it safe to assume that if I just find a dimensionally comparable match for the stock cat and have it welded in place I should be good to go? Is there a magnaflow replacement that has the o2 bung already in it or will I need to have one welded in behind the cat as an extra step?

Thanks for the help....
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Old 11-27-2011, 03:49 PM   #13
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Old 11-27-2011, 07:46 PM   #14
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You can go to magnaflows website and it will tell you how big of an engine that one is rated to.
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Old 11-28-2011, 11:42 AM   #15
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Thank you all for the info... Greatly appreciated..

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