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Old 03-29-2018, 07:19 AM
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Remove Cat?

94 6cyl 5 speed. noticed some small exhaust leaks last night so I will be getting some work done and was wondering if i should have the cat removed??
No emissions where I live.

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Old 03-29-2018, 10:19 AM   #2
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I removed my cat 15+ years ago and i am glad i did it. The flood board no longer gets so hot you can fry and egg on it and it did more on the butt dyno than my header or borla cat back. Since there is no O2 sensor behind the cat it wont trip a check engine light or cause it to run weird. Also helps keep the tranny fluid cooler, there is no reason not to remove it.
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Old 03-29-2018, 11:49 AM   #3
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Well, there is a reason to not remove it. It's illegal to do so for a vehicle that's driven on the roads. I've never heard of a person getting a ticket for removing a cat though.
Agalloch07 is correct if you plan on off road only.

A cat is just one more thing to go wrong and for whatever amount of pollution that the remaining YJs might produce if you removed every cat, just think of the pollution from the older diesel trucks.

I live where there's no emission testing and if my cat went bad, I'd replace it. Here in Colorado, some counties require emission testing and others don't. If my county were ever to require testing, I'd have to get a Howel FI setup so that I could pass. If I didn't have a cat, I'd have to put one back on.

Good Luck, L.M.
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Old 03-29-2018, 03:35 PM   #4
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Quote:
Originally Posted by Luckymac View Post
Well, there is a reason to not remove it. It's illegal to do so for a vehicle that's driven on the roads. I've never heard of a person getting a ticket for removing a cat though.
Agalloch07 is correct if you plan on off road only.

A cat is just one more thing to go wrong and for whatever amount of pollution that the remaining YJs might produce if you removed every cat, just think of the pollution from the older diesel trucks.

I live where there's no emission testing and if my cat went bad, I'd replace it. Here in Colorado, some counties require emission testing and others don't. If my county were ever to require testing, I'd have to get a Howel FI setup so that I could pass. If I didn't have a cat, I'd have to put one back on.

Good Luck, L.M.

lol well yeah if you have inspections thats a good reason not to do it. I have heard that if the vehicle is over 25 years old it becomes exempt from having a cat and you don't need one. I don't know how true that is but my YJ is going to be 25 next year and most YJ's are already over 25. But you should check your state laws to be sure, I just ignore state law since we don't have checks anyways.
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Old 03-29-2018, 05:52 PM   #5
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Mine did not have one when I first got it and the fumes where so bad you could not get around it without your clothes getting the fumes on them. If I started it in the garage with the doors open it would still get so bad you didn't want to go in. I installed a new exhaust with a new cat and the issues was gone. Mine is carbureted so I don't know if you would have the same issue with fuel injection.
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Old 03-30-2018, 12:08 PM   #6
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Originally Posted by Luckymac View Post
Well, there is a reason to not remove it. It's illegal to do so for a vehicle that's driven on the roads. I've never heard of a person getting a ticket for removing a cat though.
Agalloch07 is correct if you plan on off road only.

A cat is just one more thing to go wrong and for whatever amount of pollution that the remaining YJs might produce if you removed every cat, just think of the pollution from the older diesel trucks.

I live where there's no emission testing and if my cat went bad, I'd replace it. Here in Colorado, some counties require emission testing and others don't. If my county were ever to require testing, I'd have to get a Howel FI setup so that I could pass. If I didn't have a cat, I'd have to put one back on.

Good Luck, L.M.
There is no emission testing where I live either (rural South Texas), but there is a state "safety" inspection. If the vehicle was originally equipped with a cat, it must have one (visual inspection only in my area, and required by FEDERAL law). I just got done having exhaust work done on my Jeep and the owner of the shop would not put in a straight pipe. The State Troopers literally watch his shop for hours at a time taking notes on the vehicles coming and going. Then they cross check them back to inspection stations, and if it doesn't have a cat and is supposed to, everyone gets busted and fined. One shop in our town was suspended from conducting inspections for 6 months and had to pay a huge fine for exactly this.

And before you think "well, I'll just do it myself instead of trying to get a shop to do it", yeah, that's illegal too. It doesn't matter who did it, when it comes time to register the vehicle (annually) there is an inspection, and they'll fail you if they don't see a Cat. And before you think "well, I'll just put in something that LOOKS like a cat", yeah, that's illegal too. Though around here, it's unlikely you'd actually get caught if you did that yourself. And from what I've read (unless they amended it again), this applies even if the vehicle is considered "off road only".

So I said "fine, install a cat". Turns out it was a good idea. The Jeep runs A LOT better now. And the fumes are gone. Not that they were really that bad before, but now there are none.

As far as the heat on the floorboard, I don't know about that. I thought my floorboard would be hot, but it's not at all. Not even warm. At slow speeds, that may be different, but after a nice long drive to the next town and back, I put my hand down on the passenger floorboard, and it was ambient temperature.

So, given my experience, I would recommend replacing it.
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Old 03-30-2018, 05:52 PM   #7
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In Colorado we don't even have a safety inspection.
We used to have a safety inspection, but the liberals got rid of it because it put a 'hardship' on poor folks. Now the 'poor folks' (that incidentally run around without liability insurance) crash into the hard working folks because they are too poor to repair their automobiles.

Just SMH.

Good Luck, L.M.
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HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 03-30-2018, 06:29 PM   #8
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My jeep had horrible fumes with a catalytic converter and it's part of the reason i got rid of it. It had the sulfur rotten egg smell that is a sign of a bad converter but the cat did not rattle and seemed fine. I did a Borla cat back and i ordered a new $350 cat from Mopar and did it all at at once while i had the exhaust off. Replacing the cat did not help it made the rotten egg smell worse couldn't even drive the jeep with the top off or the back windows out it was nauseating.

I put up with it for years but i eventually got sick of it sand said screw it and gutted the new $350 Mopar cat. After gutting drove it for about a week gas mileage suffered horribly lacked power. I didn't want to spend another $350 on another cat that would just smell like rotten eggs so i bought some straight pipe just to see if it would help my gas mileage because it took a nosedive.

After removing the cat and installing the straight pipe gas mileage returned to what it had been. Rotten egg smell was gone and now it just smells like normal exhaust maybe a little small of gas once in a great while but no where near the stench of the rotten egg smell.

And yeah the floorboard will get hot enough to melt carpet in summer months with a cat when trail riding. Not that interested in boiling my tranny fluid so there is no way i'd ever run a cat again. We don't have emissions or safety checks here and if we did i'd just put a cat on it then swap the straight pipe back in once it passed. That's how much i hated the cat on my jeep.
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Old 03-31-2018, 12:11 PM   #9
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Quote:
Originally Posted by Batjac View Post
Mine did not have one when I first got it and the fumes where so bad you could not get around it without your clothes getting the fumes on them. If I started it in the garage with the doors open it would still get so bad you didn't want to go in. I installed a new exhaust with a new cat and the issues was gone. Mine is carbureted so I don't know if you would have the same issue with fuel injection.
When I got mine it had no cat on it and I installed one for this exact reason. And for those questioning the legality of running without it; my understanding is that if you're caught removing a cat it's a $15K fine. Plus, being an outdoorsy type person I am all for protecting the environment.
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