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  #1  
Old October 13th, 2006, 04:26 PM
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CAT and y-pipe help

I'm replacing everything from the manifolds back, I plan to get a custom y-pipe made. But do i need to have cats on both sides of the y-pipe? I was thinking i could have one high flow cat after the y-pipe comes to an end, then a flowmaster and pipe all the way back. I have already ordered a flowmaster 40, and magnaflow high flow cat, but do i need to order another cat? I have read their are sensors behind the cats that helps adjust a mixture?
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  #2  
Old October 13th, 2006, 08:47 PM
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Old October 13th, 2006, 11:02 PM
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thank you asshole, what gives you the fucking mind set that you can be a ass to people you don't even know?
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Old October 13th, 2006, 11:16 PM
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Old October 14th, 2006, 05:41 AM
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dont jump the gun. just trying to help.
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Old October 14th, 2006, 08:20 AM
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For the ECU to work right you need a cat on each side, and you need both O2 sensors on both sides in front and behind the cats. Now as far as what Phill posted, one he answered a question asked kinda often, "can you replace the cats on a 97 with something not stock and still have the ECU work ok" And in addition I don't think it's a big deal that he harassed you a little, you can dig right back into him, but calling him an Ahole isn't too cool seeing as he HELPED answer your question.
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  #7  
Old October 14th, 2006, 09:00 AM
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Quote:
Originally Posted by needsaD110
thank you asshole, what gives you the fucking mind set that you can be a ass to people you don't even know?
Ben you better calm down over here. These guys aren't like dwebbers. They are pretty straight forward. I think they are tired of you asking all the basic questions about your new truck, We appreciate your enthusiasm but most of your questions could be answered with the search feature.
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Old October 14th, 2006, 10:11 AM
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Quote:
Originally Posted by draaronr
Ben you better calm down over here. These guys aren't like dwebbers. They are pretty straight forward. I think they are tired of you asking all the basic questions about your new truck, We appreciate your enthusiasm but most of your questions could be answered with the search feature.
x2

An I actually thought Phil's response was generous...
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  #9  
Old October 14th, 2006, 04:35 PM
artm
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Quote:
Originally Posted by draaronr
Ben...they are tired of you asking all the basic questions [that] could be answered with the search feature.
Exactly! Mr. OME HD EE BFG THC X9 LSD synthetic line

I do recall reading up one one setup with a single cat and two O2's. It was simply parallel-wired to make the ECU see two. I can't recall if it worked though.

But why? What are you saving? An extra cat and two O2's? The generics are cheap enough now (and warranteed for 100K miles I believe) that this isn't huge savings. Plus your motor won't be running more efficiently.
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Old October 14th, 2006, 11:09 PM
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If it was a '94 or '95, it would be easy enough to say just go with a single cat. On a '97 with OBD-II, it's a trickier situation due to the post-cat O2 sensors.

But I think that the physical mounting of the cats will be a bigger problem. You could probably put a single cat in further downstream, but because of the locations of the transfer case, underseat boxes, driveshafts and all the rest of the running gear I don't know if you have the room to properly tuck it up and get enough clearance without some creative pipework. If you plan on doing any off-roading in areas with a lot of underbrush, high grass or anything similar it would be risking a grassfire under the truck. Not to mention, you're putting a pretty expensive piece in the way of rocks too. The stock location gives them quite good clearance already.

Getting a custom replacement is one thing, but I think that going away from the original configuration is going to be causing more issues than it solves.

-Hans
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  #11  
Old October 14th, 2006, 11:55 PM
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Well, you can't go too far downstream for the cat or it won't do its job. I would think fitting it just after the y-pipe connection is too far.

Again, what is the point?
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  #12  
Old October 15th, 2006, 02:18 PM
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Quote:
Originally Posted by draaronr
Ben you better calm down over here. These guys aren't like dwebbers. They are pretty straight forward. I think they are tired of you asking all the basic questions about your new truck, We appreciate your enthusiasm but most of your questions could be answered with the search feature.
I had already searched all of the cat posts, I have seen that link a couple of times. All i wanted to know if i could get away with running one CAT, but i guess i need to go order another one. I know this isn't DWEB but the night i read the post i tore up some soft tissue in my arm and their was some new scratches in the truck from i guess people in parking lots, so i was pissed. I didn't mean to go off like that
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  #13  
Old October 16th, 2006, 11:41 PM
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Quote:
Originally Posted by needsaD110
I had already searched all of the cat posts, I have seen that link a couple of times. All i wanted to know if i could get away with running one CAT, but i guess i need to go order another one. I know this isn't DWEB but the night i read the post i tore up some soft tissue in my arm and their was some new scratches in the truck from i guess people in parking lots, so i was pissed. I didn't mean to go off like that
You're not the first to go off like that. A lot of guys here are just waiting to jump all over someone for asking questions they think have been answered b/4, even if it was 5 yrs ago. Some of these guys really seem to get their rocks off by making comment like that.
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