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Unread 06-12-2003, 11:50 AM   #1
Herb Jenssen
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Catalytic converter Bypass Pipe

Anyone out there know where I can purchase a bypass pipe for a 94 ZJ 318?
My converter went bad (noisy).
Thanks
Herb

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Unread 06-12-2003, 11:52 AM   #2
Texas ZJ1
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Get a new converter and be done with it. They aren't much more than 200.

Hunter
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Unread 06-12-2003, 11:55 AM   #3
Herb Jenssen
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I guess that means you don't know where to get one?

I asked about a bypass pipe.

I know where to get a converter.
Thanks
Herb
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Unread 06-12-2003, 12:03 PM   #4
ViPER_SR2001
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How did you come up with this idea???
Either buy a new one, or put a straight pipe on it!
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Unread 06-12-2003, 12:15 PM   #5
97RedBird
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Agreed,

cut before and after the cat
let it fall
replace with straight exhaust pipe
clamp or weld into place

I personally chose to replace it with a Catco, and love the gas mileage improvement.

Don't know if you have o2 sensors or a computer, but you may get an error code you will have to ignore.
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Unread 06-12-2003, 12:16 PM   #6
Herb Jenssen
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I came up with this idea when it started making noise today.

I called around and the best price was $150.00 installed.

I can get one on the web for $89.00 but while I was under the car I thought why not just eliminate it.

I need to drive the Jeep on the street so a straight pipe is out of the question unless you mean a straight pipe to replace the converter. If this is the case that's exactly what I want.

I apologize to you and the other reply for using the wrong terminology.
Thanks
Herb
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Unread 06-12-2003, 12:21 PM   #7
Herb Jenssen
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Red Bird,
Where did you get your Catco?
What kind of mileage improvement did you get?

I don't have a torch so I imagine it will be a b____ to get off.

Did you cut yours off and then replace it?
Thanks
Herb
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Unread 06-12-2003, 12:32 PM   #8
97RedBird
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Sorry it was CarSound not Catco,

I ordered it from http://www.warpspeedperformance.com/jeep.htm

I talked with them on the phone and they sent me out the cat, muffler, clamps, and adaptors. Muffler is a louder than stock, but the combination keeps our jeep at 20-22 mpg with 50/50 city highway driving all the time.


we were referring to a straight pipe as just a foot and half length of 2 1/2" exhaust pipe. the pipe replacement will work and is very cheap intitially, but I don't know how the gas mileage will be.

If you have a sawzall, cut the thing out yourself and put it back together and same yourself a lot of money. I borrowed a sawzall from my neighbor and put it in.
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Unread 06-12-2003, 12:36 PM   #9
97RedBird
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Your terminology was fine, I just thought it was funny to bypass the converter. Because the way you stated it is true.

You see it as bypassing the cat.
I just see it as removing the cat.

To each their own. both are correct statements and it's funny I would never have saying anything else. I'm just stuck in a one track mind I guess.
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Unread 06-12-2003, 12:39 PM   #10
97RedBird
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When clamping the exhaust pipes, I did purchase exhaust pipe repair glue and used it as a sealant before I tightened the clamps. Worked good on my old cars so I thought it wouldn't hurt on my jeep.

Now I have a welder so I would probably do that next time.
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Unread 06-12-2003, 12:53 PM   #11
Texas ZJ1
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You may or may not have check engine light issues if you go with the straight pipe.


You can use a dremel tool with a carbide tip cutter to take cut the pipe. (just wear safety glasses)

I'm guessing that you still want the cat. Redbird is really hooking you up.

Hunter
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Unread 06-12-2003, 01:03 PM   #12
Herb Jenssen
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I'm not sure whether I want the cat or not.

I guess my Jeep was trying to tell me something because I would get a check engine light every so often but it would go out as soon as I shut it down and started up again.

I probably have a bad O2 sensor and maybe by ignoring it my cat went bad.

I don't know. I've got 152,000 on the ZJ so maybe the cat was ready to go. I guess I better check out the O2 sensor.

I'll say one thing about this forum.

Somebody "ANSWERS" you!

I've asked questions on another forum called Quadratec and never get a reply.
ThankYou!

Also, does someone make a straight pipe to replace the cat or do you have to fabricate your own?

Later
Herb

Last edited by Herb Jenssen; 06-12-2003 at 01:13 PM..
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Unread 06-12-2003, 01:46 PM   #13
CATMAN2
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I REPLACED MINES ON STAURDAY. THEY RAN A STARIGHT PIPE AND ALSO PUT THE O2 SENSOR IN IT. HOWEVER CHECK ENGINE LIGHT DID COME ON.....IF ONLY I GET IT OFF.
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Unread 06-12-2003, 02:40 PM   #14
97RedBird
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I like to check this forum for jeep stuff and fbody.com for my TA stuff. I love seeing everyone's answers.


the straight pipe - I've gone to Midas and bought 3 foot of pipe real cheap before.

cat might have caused the 02 to go bad also. Either way they can do that to each other.

I had to replace my cat after only 110k miles and the o2 failed after reinstalling it on the new cat so I replaced it. I had planned on replacing it anyways so I wasn't to dissappointed.

Last edited by 97RedBird; 06-12-2003 at 02:42 PM..
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Unread 06-12-2003, 03:24 PM   #15
ViPER_SR2001
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You can also buy a simulator for the o2 sensor... no check egine light!
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