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Old 04-17-2006, 10:26 AM   #1
AE86Lover
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Join Date: Mar 2006
Posts: 112
Default Oem Catalytic Converter vs. High Flow Cat..

I need a catalytic converter for my car and i was wondering, what the main differences are in a high flow catalytic converter..

PDM is pleased to announce a brand new product. Teamed with Magnaflow, PDM is able to offer a bolt-in replacement high flow 2.25" Catalytic Converter for the Toyota Corolla.
Toyota Corolla High Flow Cat

Over time, your stock catalytic converter will begin to plug up from residual oil, and from cleaning up the carbon monoxide from your hard working engine?s exhaust. Renew your car?s performance with true high flow catalytic converter that keeps the environment clean, and adds performance back to your Corolla.


Mirror finish stainless steel, high-flow catalytic converter with proper Toyota Corolla flanges welded in place. These are not universal fit type catalytic converters which rotate and slide around, but specific high-flow cats that PDM cuts to length, and welds 3/8? thick, 2.25? i.d. beefy steel flanges.

http://www.pdm-racing.com/products/i...lowcat_web.jpg

Features of this high quality Cat include:


- Recessed Cushioning Mat to help hold the catalyst firmly in place and protect it from direct exhaust flow.
- Special ? lap joint to help create a smooth transition in and out of the converter
- 409 16 gauge stainless steel neck and body to resist corrosion and high operating temperatures.
- Mirror finish stainless steel heat shield.
- Quad ribbed body for strength from heat
- Seam welded interior on top and bottom to help minimize distortion
- High flow honeycomb catalyst for optimum flow.

Comes complete with 2 exhaust gaskets, and hardware to bolt in as a direct replacement for your OEM Toyota Catalytic converter.


http://www.pdm-racing.com/products/toyota_corner.html
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Old 04-17-2006, 10:29 AM   #2
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Default Oem Catalytic Converter vs. High Flow Cat..

If it isn't metallic substrate its not really a high-flow cat. That said, unless your stock cat is old and clogged then any cat will be better. Honestly, this cat vs. a "normal" cat is not going to make a noticeable difference on performance.
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Old 04-17-2006, 10:50 AM   #3
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Default Oem Catalytic Converter vs. High Flow Cat..

Yeah, you're not going to see any noticeable gain just by swapping in a "high flow" cat. If you had significant engine mods and a bigger exhaust , then a high-flow cat would be justified.
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Old 04-17-2006, 10:52 AM   #4
AE86Lover
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Default Oem Catalytic Converter vs. High Flow Cat..

Quote:
Originally posted by: Heisenberg
Yeah, you're not going to see any noticeable gain just by swapping in a "high flow" cat. If you had significant engine mods and a bigger exhaust , then a high-flow cat would be justified.
what about in terms of how much CO it absorbs? Would the HIGH FLOW absorb the same amount as a regular CAT?
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Old 04-17-2006, 10:56 AM   #5
Heisenberg
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Default Oem Catalytic Converter vs. High Flow Cat..

Quote:
Originally posted by: AE86Lover
Quote:
Originally posted by: Heisenberg
Yeah, you're not going to see any noticeable gain just by swapping in a "high flow" cat. If you had significant engine mods and a bigger exhaust , then a high-flow cat would be justified.
what about in terms of how much CO it absorbs? Would the HIGH FLOW absorb the same amount as a regular CAT?
Well, first of all a cat doesn't absorb CO. It converts CO to CO2, and converts other exhaust gases as well. Ideally, you would see the same conversion efficiency out of a high-flow cat that you would of an OEM. In reality, most high-flow converters probably sacrifice some efficiency for performance.
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Old 04-17-2006, 02:39 PM   #6
AE86Lover
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Default Oem Catalytic Converter vs. High Flow Cat..

Quote:
Originally posted by: Heisenberg
Quote:
Originally posted by: AE86Lover
Quote:
Originally posted by: Heisenberg
Yeah, you're not going to see any noticeable gain just by swapping in a "high flow" cat. If you had significant engine mods and a bigger exhaust , then a high-flow cat would be justified.
what about in terms of how much CO it absorbs? Would the HIGH FLOW absorb the same amount as a regular CAT?
Well, first of all a cat doesn't absorb CO. It converts CO to CO2, and converts other exhaust gases as well. Ideally, you would see the same conversion efficiency out of a high-flow cat that you would of an OEM. In reality, most high-flow converters probably sacrifice some efficiency for performance.
thanks for input.
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Old 04-17-2006, 02:46 PM   #7
blahblah99
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Default Oem Catalytic Converter vs. High Flow Cat..

Quote:
Originally posted by: AE86Lover
I need a catalytic converter for my car and i was wondering, what the main differences are in a high flow catalytic converter..

PDM is pleased to announce a brand new product. Teamed with Magnaflow, PDM is able to offer a bolt-in replacement high flow 2.25" Catalytic Converter for the Toyota Corolla.
Toyota Corolla High Flow Cat

Over time, your stock catalytic converter will begin to plug up from residual oil, and from cleaning up the carbon monoxide from your hard working engine?s exhaust. Renew your car?s performance with true high flow catalytic converter that keeps the environment clean, and adds performance back to your Corolla.


Mirror finish stainless steel, high-flow catalytic converter with proper Toyota Corolla flanges welded in place. These are not universal fit type catalytic converters which rotate and slide around, but specific high-flow cats that PDM cuts to length, and welds 3/8? thick, 2.25? i.d. beefy steel flanges.

http://www.pdm-racing.com/products/i...lowcat_web.jpg

Features of this high quality Cat include:


- Recessed Cushioning Mat to help hold the catalyst firmly in place and protect it from direct exhaust flow.
- Special ? lap joint to help create a smooth transition in and out of the converter
- 409 16 gauge stainless steel neck and body to resist corrosion and high operating temperatures.
- Mirror finish stainless steel heat shield.
- Quad ribbed body for strength from heat
- Seam welded interior on top and bottom to help minimize distortion
- High flow honeycomb catalyst for optimum flow.

Comes complete with 2 exhaust gaskets, and hardware to bolt in as a direct replacement for your OEM Toyota Catalytic converter.


http://www.pdm-racing.com/products/toyota_corner.html
It's not going to make a different on a car that's pushing 100rwhp. If you turbo it up, however, it will be a different story.
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Old 04-17-2006, 04:29 PM   #8
fbrdphreak
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Default Oem Catalytic Converter vs. High Flow Cat..

Don't waste your money.

In terms of efficiency converting CO to CO2, I think its a matter of surface area. TMK, a cat converts CO to CO2 via the hot metal inside the cat. When the gas reacts to the super hot metal, the reaction produces CO2 (trying to remember high school chemistry...). Accordingly, it seems to me like the surface area of the metal (thus the amount of metal contacting the CO to convert it to CO2) would be the appropriate measure of its efficiency. If I had to guess, a high-flow cat probably produces higher emissions than a standard cat.
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Old 04-17-2006, 04:36 PM   #9
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Default Oem Catalytic Converter vs. High Flow Cat..

Besides, as far as legality goes you might as well run catless vs. most high flows. Not that they don't work...just not "approved".

Welcome to Cali.......
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Old 04-17-2006, 05:04 PM   #10
Insane3D
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Default Oem Catalytic Converter vs. High Flow Cat..

My Mustang ran cleaner on the emissions test (when we had that here) without the four stock cats than it did with them. That being said, those magnaflow cats are top notch. If you are going to get one, I know a site that sells Magnaflow stuff cheap and free shipping...
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Old 04-17-2006, 05:31 PM   #11
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Default Oem Catalytic Converter vs. High Flow Cat..

I have an Audi A4 1.8T turbo, and it made a small difference in performance. I also have an aftermarket turbo back exhaust, helps the turbo spool up a bit faster. But for N/A engines, not sure how much difference just a high flow cat will make.
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Old 04-17-2006, 05:38 PM   #12
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Default Oem Catalytic Converter vs. High Flow Cat..

Quote:
Originally posted by: tontod
I have an Audi A4 1.8T turbo, and it made a small difference in performance. I also have an aftermarket turbo back exhaust, helps the turbo spool up a bit faster. But for N/A engines, not sure how much difference just a high flow cat will make.
The turbo back makes more of a difference than the cats. Get the tune to match
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Old 04-17-2006, 09:17 PM   #13
tontod
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Default Oem Catalytic Converter vs. High Flow Cat..

Quote:
Originally posted by: NutBucket
Quote:
Originally posted by: tontod
I have an Audi A4 1.8T turbo, and it made a small difference in performance. I also have an aftermarket turbo back exhaust, helps the turbo spool up a bit faster. But for N/A engines, not sure how much difference just a high flow cat will make.
The turbo back makes more of a difference than the cats. Get the tune to match
You are right, the gains with the high flow cat are small compared to the exhaust, but a gain nonetheless

Here are a couple of clips:

Standstill revs

Driving away
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Old 04-17-2006, 09:18 PM   #14
tontod
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Default Oem Catalytic Converter vs. High Flow Cat..

Quote:
Originally posted by: tontod
Quote:
Originally posted by: NutBucket
Quote:
Originally posted by: tontod
I have an Audi A4 1.8T turbo, and it made a small difference in performance. I also have an aftermarket turbo back exhaust, helps the turbo spool up a bit faster. But for N/A engines, not sure how much difference just a high flow cat will make.
The turbo back makes more of a difference than the cats. Get the tune to match
You are right, the gains with the high flow cat are small compared to the exhaust, but a gain nonetheless

Here are a couple of clips:

Standstill revs

Driving away
Its all about lowering restriction in the exhaust, higher airflow is good

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Old 04-17-2006, 10:58 PM   #15
Viperoni
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Default Oem Catalytic Converter vs. High Flow Cat..

Quote:
Originally posted by: Insane3D
My Mustang ran cleaner on the emissions test (when we had that here) without the four stock cats than it did with them. That being said, those magnaflow cats are top notch. If you are going to get one, I know a site that sells Magnaflow stuff cheap and free shipping...
QFT!

I had a magnaflow highflow cat on my 92 Topaz V6 5speed, original o2 sensors, and it passed etest with flying colours. Picked up performance too, I highly recommend them!
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Old 04-18-2006, 12:10 AM   #16
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Default Oem Catalytic Converter vs. High Flow Cat..

Yeah, I wouldn't do it unless you needed to.

Case in point, the exhaust on the '95 Accord I had rusted out. The cat was rusted to the exhaust as well. So I replaced them with a Magnaflow Cat and RS*R exhaust. Cost half of what all new stock parts would've cost
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