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Ok a bud of mine in our car club has a HONDA (no flaming please) and has performance cats on his accord and they show no real sign of performance improvement, ok now to the question my 98 se smells like s@#t from the exhaust like eggs etc... would it be better to put a stock cat on or go with a performance cat?
1995 Suburban
two tone black and silver paint
full black and white leopard interior
20" spoke wheels
bagged fbss runnin nitrogen
2 kicker comp vr 12
1996 Contour Vtech ATX
1998.5 Silver Frost SEVT RIP(5-18-03)
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Performance-oriented cat. It won't show much improvement by itself but the more you add to your car the less restrictive it will be compared to the stock. It doesn't 'add' hp - just lets the engine run more efficiently over all.
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The only real way to get a performance gain from a main cat is to gut it and prefurably replace it with a peice of pipe. Like you would when removing the resonater. Hince why most, if where planning on gutting or have gutted their main cat, will go with an off road y-pipe. This off road y-pipe basically replaces your current hellbent y-pipe with one a little more flow friendly and no main cat. You can get the y-pipe with a high flow cat, but I am not sure how many have one or the other.
Now some will tell you that a y-pipe can actually hurt you in some ways. There were some mounting issues along with noise (vibration), but those have pretty much been taken care of. Also with heat. There are some concerns among a few here that without the stock y-pipes heatsheild, which basically protects the lower engine from the awsome amount of heat that can be produced from this area, you are asking for trouble. This is addressed by getting one with a ceramic coating (or you could paint it yourself) and can be further addressed with heat wrap.
Overall though, you would not gain a whole lot from just adding a high flow main cat. Notice I said, "Not a whole lot!". You might gain more by just taking it out of the picture.
As for the precats, either gut them or get headers.
Phillip Jackson
`98 Mystique LS
262K+ and counting...
ATX rebuilt @ 151K
"This storm has broken me, my only friend!" RIP Dime
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Joined: Mar 2001
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Just to share with you: Jet Hot coated
This is from the Sho Shop Y-pipe, with heat problems in mind, we ceramic coated the entire Y-pipe and externally coated the cat.
(Try link again, if not my webpage below)
Last edited by Speed Demons; 03/24/03 05:14 PM.
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Originally posted by silver98:
Ok a bud of mine in our car club has a HONDA (no flaming please) and has performance cats on his accord and they show no real sign of performance improvement, ok now to the question my 98 se smells like s@#t from the exhaust like eggs etc... would it be better to put a stock cat on or go with a performance cat?
Correct me if I am wrong, but Contour stock cats have 2 way catalysts and most, if not all, aftermarket cats have 3 way catalysts. What does this mean, you should get cleaner emissions. Now as far as high flow, most aftermarket cats flow about the same as stock cats. Some aftermarket cats are truly higher flowing cats. We have seen 2 mainstream style of cats, ones with a 12" body and ones with a 16" body. The longer cats generally are the true high flow cats, with more material but larger passages through the material. Since they flow more, they require a longer length to match the conversion properties of the shorter, not so high flowing cats.
Where does this all lead? Most universal replacement cats may not produce any power gains over a stock cat (many variables depending) but will produce cleaner emissions. True high flow cats will gain you a little now, with cleaner emissions, but look at the future, they will flow more than the standard replacement and stock cats. We carry Car Sound (and have for a while), which is Magnaflow, and we are able to offer the true high flow cats for the same price as the standard Car Sound cat, since we have recently picked up an account with a local Magnaflow supplier. 
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Originally posted by Speed Demons:
Just to share with you: Jet Hot coated Cat
This is from the Sho Shop Y-pipe, with heat problems in mind, we ceramic coated the entire Y-pipe and externally coated the cat.
Bad link...no can see...
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Originally posted by cawong11:
Originally posted by silver98:
Ok a bud of mine in our car club has a HONDA (no flaming please) and has performance cats on his accord and they show no real sign of performance improvement, ok now to the question my 98 se smells like s@#t from the exhaust like eggs etc... would it be better to put a stock cat on or go with a performance cat?
Correct me if I am wrong, but Contour stock cats have 2 way catalysts and most, if not all, aftermarket cats have 3 way catalysts. What does this mean, you should get cleaner emissions. Now as far as high flow, most aftermarket cats flow about the same as stock cats. Some aftermarket cats are truly higher flowing cats. We have seen 2 mainstream style of cats, ones with a 12" body and ones with a 16" body. The longer cats generally are the true high flow cats, with more material but larger passages through the material. Since they flow more, they require a longer length to match the conversion properties of the shorter, not so high flowing cats.
Is there a weight savings with an aftermarket cat?
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anothe reason to go aftermarket is the price. the cost of buying an OEM cat is expensive, when you can just get an aftermarket cat for much less and just have them weld it in place of the stock cat.
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Will replacing it elimanate the egg smell I have heard to gut them is a waist, I had a bud gut his cats and I still beat him with the stock cats like they are we both have the same model cars with the same mods
1995 Suburban
two tone black and silver paint
full black and white leopard interior
20" spoke wheels
bagged fbss runnin nitrogen
2 kicker comp vr 12
1996 Contour Vtech ATX
1998.5 Silver Frost SEVT RIP(5-18-03)
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Posts: 1,625
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Originally posted by MonkeyBiz:
Is there a weight savings with an aftermarket cat?
Uhmm, sometimes yes, sometimes no. Most of the aftermarket cats, universal ones, are of about the same sizes and weight. Comparing the stock duratec main cat versus a universal replacement cat, very little difference in weight but the universal one is a bit lighter.
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