LT1-LT4 Modifications 1993-97 Gen II Small Block V8

1995 dual cat question

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Old Jun 5, 2017 | 06:48 PM
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Default 1995 dual cat question

so one cat on the drivers side is right under the manifold right? and the other in under the passenger side in the middle-ish?

can i just put single cat headers on it?
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Old Jun 5, 2017 | 08:14 PM
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bump guys :/ i just need to know what my options are with single cat headers and a dual cat car
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Old Jun 5, 2017 | 10:23 PM
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What are your emissions concerns?
If you have no emissions problems/inspections put longtubes on.

If emissions are a factor you can run headers and Y pipe for a 94/95 using 1 large cat or you can purchase thirties for 96/97 and fabricate a dual cat Y pipe that will save you a lot of cash.
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Old Jun 5, 2017 | 10:30 PM
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If you have strict emissions laws, the cats must remain in the factory installed position.
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Old Jun 6, 2017 | 11:19 AM
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Are you asking if you can use single cat headers with your dual cat y-pipe? If so, you can't. You will also have to get a single cat y-pipe, and as stated, if your car came with dual cats from the factory you will most likely fail and/or emissions/safety inspection.
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Old Jun 7, 2017 | 10:07 AM
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I have a 96 that came with the dual cat setup. I removed the entire system, installed the ASM mid lengths and converted to a single, high flow cat setup. No issues at all, and they are very strict regarding emissions where I am at.

However, I didnt think they started doing dual cat setups until the 96 model so you might want to crawl under there and double check your 95.
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Old Jun 7, 2017 | 10:59 AM
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Originally Posted by Gangly
I have a 96 that came with the dual cat setup. I removed the entire system, installed the ASM mid lengths and converted to a single, high flow cat setup. No issues at all, and they are very strict regarding emissions where I am at.

However, I didnt think they started doing dual cat setups until the 96 model so you might want to crawl under there and double check your 95.
From the quick and dirty research I just did where shoebox was involved it was stated '95 California cars received a dual cat system, but were still OBDI.

https://www.camaroz28.com/forums/lt1...al-cats-71921/


As far as emissions they may only care there is a catalytic converter, but if I'm not mistaken, to remove/modify/move a cat from its stock location is a federal crime under the clean air act and a shop can be fined heavily if caught.

Last edited by SS RRR; Jun 7, 2017 at 11:13 AM.
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Old Jun 7, 2017 | 01:46 PM
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My neighbor (I live in Calif) 95 has dual CATS, OBD 1

Here in CA the CAT has to remain in its stock location...

Huge fine if you are caught with no CATS out here

I was fortunate enough to have a shop install 2 1/2" CATS as my car came with 2 1/4" pipe. That was years ago. Now a shop would not do that..."legally"..here in CA

IDK what emission standards the OP's state has
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Old Jun 9, 2017 | 03:10 PM
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Yes you can get single cat headers but need the y pipe to go with it. Get a universal CARB compliant magnaflow cat and your good. My 95 was dual cat and I went long tubes then back to mids for a single cat car and a magnaflow cat. Passed visual and sniffer just fine in CA.
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Old Jun 9, 2017 | 03:14 PM
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Before you modify anything on your exhaust it would probably be a good idea to call some emissions stations and see what they have to say.
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Old Jun 9, 2017 | 08:41 PM
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Originally Posted by Gangly
I have a 96 that came with the dual cat setup. I removed the entire system, installed the ASM mid lengths and converted to a single, high flow cat setup. No issues at all, and they are very strict regarding emissions where I am at.

However, I didnt think they started doing dual cat setups until the 96 model so you might want to crawl under there and double check your 95.
95 CA cars had dual cats. And if OP is in an emissions county there, the cats have to remain in the stock location.

I'd hardly call Houston strict. I have high flow cats on LT's that pass inspection here, but that would never fly in Nazifornia (used to live there).
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Old Jun 9, 2017 | 10:08 PM
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Originally Posted by Spartan7
95 CA cars had dual cats. ...
...if the car was an A4. All 1995 M6 cars, regardless of state, had one cat.
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Old Jun 9, 2017 | 10:33 PM
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Originally Posted by shbox
...if the car was an A4. All 1995 M6 cars, regardless of state, had one cat.
Weird. Why?
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Old Jun 10, 2017 | 07:40 AM
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Originally Posted by SS RRR
Weird. Why?
IDK, good bet it was an emissions thing...maybe the lower idle speed of the auto had something to do with it.
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