New Cat. Or Straight Pipe? - JeepForum.com

 
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post #1 of 13 Old 09-05-2003, 11:44 AM Thread Starter
GrandRubicon155
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New Cat. Or Straight Pipe?

well my cat. converter is rattleing very badly so i'm pretty sure it's burnt out. after 170,000 i think that's a safe bet. now the issue is should i get a new stock cat. a high flow cat. or just put a test pipe on, and get a cat. in 2 years when i have to get emmisions done. i have a flowmaster exhaust, do you think the straight pipe would make a noticable difference? what do you guys think?

sean


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post #2 of 13 Old 09-05-2003, 02:15 PM
Joseph Humphrey
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it would all depend on what you are going to be using your zj for...? if its just a street jeep i would get a stock cat.
if you are trying to put together a performance jeep and a little off roading, get a high flo cat.
if its just a rock crawler, just put a straight 3" pipe from the headers...

sorry if my reply really doesnot answer your question, but there you go just the same.

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post #3 of 13 Old 09-06-2003, 09:48 AM
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I say forget about stock either go high flow or no cat

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post #4 of 13 Old 09-07-2003, 06:53 PM
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well i'd say definitly don't get another stock cat. if you're going to have to replace it why not get one that's going to enhance performance. the price difference is not that much. if you want to take the risk just put a strait pipe in, it will enhance performance the most but if you get caught it's going to be hell to pay.

either way there will be a noticable difference in exhaust sound.

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post #5 of 13 Old 09-08-2003, 08:53 AM
Whybu1
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If you use it on road at all, put a cat on it. The fine isn't worth not having one if you get caught.
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post #6 of 13 Old 09-09-2003, 02:19 PM
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Quote:
Originally Posted by Whybu1
If you use it on road at all, put a cat on it. The fine isn't worth not having one if you get caught.
Oh, yeah the cops hand out a lot of tickets for that here ------- not.

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post #7 of 13 Old 09-11-2003, 08:29 AM
Whybu1
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OK, just be warned. If you have state inspection it won't pass, mechanics at a reputable place can't legally work on your Jeep and IF you are caught by some officer who just happens to notice it you will pay way more than teh cost of the new high flow cat. Your dime, just trying to help.
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post #8 of 13 Old 09-11-2003, 11:12 AM
techie
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I say go with OEM and an exhaust cutout. Best of both worlds. Stock when you want it, everyday driving and 'need to be legal' times, then just open it up when you need straight pipe performance. I don't know if they check for an exhaust cutout during vehicle/emmision inspections though.

Depending where you put it, before cat or after cat will make a difference in performance increase. Just check around for one with a good reputation. Some switch between one way or the other. Some just open to flow through both. I've seen some people disatisfied with certain brands when I was checking them out once online.
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post #9 of 13 Old 09-11-2003, 01:25 PM
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I'd recomend not replacing it with another stock one. Get a high flow cat if your really worried about the ticket thing, but personally I'd run a straight pipe and worry about emmisions when the time comes for inspection.
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post #10 of 13 Old 11-11-2003, 08:34 PM
199859Limited
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Gutting Cat

Would it just be possible to gut the inside of the existing cat, maybe taking a large pipe and just hamering on the honeycomb untill you have a straight shot?
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post #11 of 13 Old 11-12-2003, 01:51 AM
horatio102
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A lot of people gut their cats. If you're broke, fine. But if you can afford to, just get a high flow cat. They do make a difference in the sound and performance. I don't have cats in my Dodge, but it came that way from the factory. And trust me, it was hell getting a muffler shop to weld up my exhaust without them.
If you remove the cat on an OBD2 vehicle you'll most likely get a CEL.
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post #12 of 13 Old 11-13-2003, 08:37 AM Thread Starter
GrandRubicon155
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hey guys, i got a high-flow cat installed and i love it. i couldn't believe the sound difference it made. with the 40 series muffler my jeep sounds incredible. thanks for all the help.

sean

99' TJ Sport, 31inch MTR's, Lift Comming Soon
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post #13 of 13 Old 11-19-2003, 08:42 AM
KillerZJ
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Was it a deeper rumble? how does it sound on the high-end? do you have a 4.0 or a 5.2? I'm looking at a 40 series and I was just going to remove the cat. SC doesnt have emissions testing! How would it sound for me?

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