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Catalytic converter

Old 06-28-2017, 05:18 PM
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Default Catalytic converter

My catalytic converter rusted off where it connects to the exhaust pipe closest to the engine. Advance Auto is showing Magnaflow and Walker either universal and direct fit. Which one is correct or is there another brand that I should go with? I'm assuming direct fit is best? Thanks.
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Old 06-28-2017, 06:46 PM
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OEM cats are the best flowing by far. Anything 50 state legal is high flowing. Look for the one that is legal in the most states to get the closest to factory flow.
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Old 06-28-2017, 06:49 PM
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I went with a Magnaflow direct replacement cat for my one cat exhaust system, no complaints.

On the other hand i replaced the muffler with a Walker that was a POS.
Ended up with a Flowmaster direct replacement, i think its called a super 50, no regrets.
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Old 06-28-2017, 07:43 PM
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Life is too short to spend way too much on a muffler,
Walker 21357 Quiet-Flow Stainless Steel Muffler.
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Old 06-28-2017, 07:47 PM
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Originally Posted by Turbo X_J View Post
Life is too short to spend way too much on a muffler,
Walker 21357 Quiet-Flow Stainless Steel Muffler.
No offense, that walker is a POS. Had one and it rusted out at the ends and leaked. I haven't found a good moderate price muffler yet. Even the dyno.ax one I had lasted a good amount but that really rusted everywhere Lololololol.
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Old 06-28-2017, 08:14 PM
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Thanks guys
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Old 06-29-2017, 12:33 AM
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Note from DJ
If you live in California you better by a California certified Cat.
I just had my 88 tested last week. It passed all the tests with less than average numbers which are less than the Maximum allowed numbers. But the technician doing the test surprised by saying you failed.
Why I asked when my numbers are all good?
He told me that as of a couple years ago you must have a certified California cat.
Well after more discussion about my failure he told me the whole story.
If I had my cat replaced before 2009 and had the paper work to prove it; bring him the paperwork proving it and I would not have to by another one.
I came home and found the paperwork dated 2003 returned to the test station; he looked at the paperwork and says you’re good to go. Keep the paper work and take it with you in two years so that you don’t have to go home and get it again.
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Old 06-29-2017, 08:43 AM
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Originally Posted by Turbo X_J View Post
Life is too short to spend way too much on a muffler,
Walker 21357 Quiet-Flow Stainless Steel Muffler.
A Walker quiet flow is what i had installed by a muffler shop.
The dam thing vibrated the Jeep at around 2k rpm.
And i mean a LOUD vibration. Maybe it was defective, who knows.

It was on my Jeep for only a couple days then replaced with the Flowmaster.
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Old 06-29-2017, 08:53 AM
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Originally Posted by djgrayxj View Post
Note from DJ
If you live in California you better by a California certified Cat.
I just had my 88 tested last week. It passed all the tests with less than average numbers which are less than the Maximum allowed numbers. But the technician doing the test surprised by saying you failed.
Why I asked when my numbers are all good?
He told me that as of a couple years ago you must have a certified California cat.
Well after more discussion about my failure he told me the whole story.
If I had my cat replaced before 2009 and had the paper work to prove it; bring him the paperwork proving it and I would not have to by another one.
I came home and found the paperwork dated 2003 returned to the test station; he looked at the paperwork and says youíre good to go. Keep the paper work and take it with you in two years so that you donít have to go home and get it again.
CALIFORNIA LAWS =
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Old 06-29-2017, 09:05 AM
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Originally Posted by moparado View Post
A Walker quiet flow is what i had installed by a muffler shop.
The dam thing vibrated the Jeep at around 2k rpm.
And i mean a LOUD vibration. Maybe it was defective, who knows.

It was on my Jeep for only a couple days then replaced with the Flowmaster.
my walker was quiet, however I've heard that a lot.of the lm break on the inside and rattle. So if you get a good one you're good until the ends rust but if you get a bad one, eh.
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Old 06-29-2017, 10:48 AM
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I recently had to replace the exhaust on my 98. I went with this cat converter.
Amazon Amazon

direct replacement. I'm in VA so didn't need to worry about the CA laws.

I also went with walker due to cost. I did get the upgraded muffler though. WALKER 21357
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Old 06-29-2017, 12:13 PM
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Iirc, if your jeep came with call emissions, your not suppose to alter it otherwise. Even if you don't live in Cali. I forgot.how that works though.
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Old 06-29-2017, 02:22 PM
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Not sure why people are talking about mufflers when OP didn't ask about mufflers. I think maybe y'all need some of them fancy fidget spinners to help you focus.

Originally Posted by rgr4475 View Post
I'm assuming direct fit is best?
"Direct fit" in this context means it will have the flanges on it to bolt to the flanges on the factory crossover pipe and cat-back. The universal fit converters don't have that flange, so they won't just bolt on. They have to either be welded or clamped in place.

Which one you need depends on whether you still have the flanges on your other exhaust parts. If you still have the flanges, you can buy the direct fit and bolt it up with a couple of wrenches. If your flanges rusted off or were otherwise removed, the universal fit will be $20-30 cheaper without those flanges you can't use anyway.

Also, keep in mind that if you buy direct fit, you'll want to get the correct one for your emissions system. In 2000 you had a California version that didn't have a bung for an O2 sensor in the main cat, and an EPA version that did. You can look on the firewall in front of the driver inside the engine bay to see which emissions version you have. Or you can just look under the vehicle and see if your main cat has an O2 sensor sticking out of it. If it does, it should be EPA.

If you have the EPA emissions and inadvertently buy the CA version, you won't have anywhere to plug in the O2 sensor. If you have the CA emissions and buy the EPA version, you'll have to plug that hole.

Originally Posted by rgr4475 View Post
Advance Auto...
I just price checked the Walker direct fit EPA version, and it's $46 cheaper at Amazon for the exact same part. Although that may not be the exact one you need, I would definitely suggest shopping around and not just buying it at Advance unless you need it quickly.

Originally Posted by rgr4475 View Post
... is showing Magnaflow and Walker either universal and direct fit. Which one is correct or is there another brand that I should go with?
Magnaflow makes a quality product. Walker is meh but usable.

If you end up going with a universal fit, some people have reported good results from Performance-Curve.com. They make universal high-flow cats that are a LOT cheaper than Magnaflow.
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Old 06-29-2017, 11:03 PM
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If you are able, use these.

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Old 06-30-2017, 10:11 AM
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Originally Posted by extrashaky View Post
Not sure why people are talking about mufflers when OP didn't ask about mufflers. I think maybe y'all need some of them fancy fidget spinners to help you focus.



"Direct fit" in this context means it will have the flanges on it to bolt to the flanges on the factory crossover pipe and cat-back. The universal fit converters don't have that flange, so they won't just bolt on. They have to either be welded or clamped in place.

Which one you need depends on whether you still have the flanges on your other exhaust parts. If you still have the flanges, you can buy the direct fit and bolt it up with a couple of wrenches. If your flanges rusted off or were otherwise removed, the universal fit will be $20-30 cheaper without those flanges you can't use anyway.

Also, keep in mind that if you buy direct fit, you'll want to get the correct one for your emissions system. In 2000 you had a California version that didn't have a bung for an O2 sensor in the main cat, and an EPA version that did. You can look on the firewall in front of the driver inside the engine bay to see which emissions version you have. Or you can just look under the vehicle and see if your main cat has an O2 sensor sticking out of it. If it does, it should be EPA.

If you have the EPA emissions and inadvertently buy the CA version, you won't have anywhere to plug in the O2 sensor. If you have the CA emissions and buy the EPA version, you'll have to plug that hole.



I just price checked the Walker direct fit EPA version, and it's $46 cheaper at Amazon for the exact same part. Although that may not be the exact one you need, I would definitely suggest shopping around and not just buying it at Advance unless you need it quickly.



Magnaflow makes a quality product. Walker is meh but usable.

If you end up going with a universal fit, some people have reported good results from Performance-Curve.com. They make universal high-flow cats that are a LOT cheaper than Magnaflow.
Thanks for the detailed reply. I went with the Walker Direct fit. I used a 30% off coupon and got it for $65. It has the hole where the O2 sensor goes. I couldn't get the old O2 sensor off so I am waiting for one from RockAuto to come today.

Also, I had a Walker Quiet Flow exhaust on there without any problems. I could not for the life of me get the exhaust and the Catalytic converter apart without damaging the muffler. So I ended up getting another quiet flow. Hate being in the Northeast with all of the salt.

Installation was easy but in the process, the exhaust hanger for the pipe in front of the CC broke. Going to attempt to get this welded.
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