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I am currently running an 08 GT 500 putting down abour 750 rwhp and the car definitely moves, but the sound is awful. I have american racing long tube headers and used to have american racing cats but they were blown out. Because of this, the sound is EXTREMELY raspy and I cant stand it anymore. My question though is can I tune my car to stop from blowing out the american racing high flow cats, or are there other cats that I could buy that wont get blown out? I want something to cut down the rasp so it has that deep sound that the mustangs are famous for. Any suggestions on what I can do to solve the rasp problem?
 

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I have read that high hp and or blown motors tend to blow out cats rather quickly. I recently blew out my pypes "high flow" cat on my vortech stang. I switched from the ceramic substrate to their metallic substrate model per their website recommendation which explained the metallic was specifically designed for boosted cars.

They sound the same as my old ones, but time will tell if they hold up.


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I have read that high hp and or blown motors tend to blow out cats rather quickly. I recently blew out my pypes "high flow" cat on my vortech stang. I switched from the ceramic substrate to their metallic substrate model per their website recommendation which explained the metallic was specifically designed for boosted cars.

They sound the same as my old ones, but time will tell if they hold up.


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Gonna call bs. You're saying that ferraris and lamborghinis blow cats all the time? I don't see how they could sell a car with faulty cats


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I would weld in the factory Ford cats as they are higher quality than the aftermarket stuff.
Do you seriously think that the stock, very restrictive, 2 1/4" cats are the best option for a 2 1/2" system?

---------- Post added at 05:25 PM ---------- Previous post was at 05:23 PM ----------

Gonna call bs. You're saying that ferraris and lamborghinis blow cats all the time? I don't see how they could sell a car with faulty cats


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I'm not seeing where he mentioned either Ferrari or Lamborghini.
 

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Like I said, when did he mention Ferraris or Lamborghini's?

BTW, my friend's GT500 picked up over 20rw with longtubes and that was at a lower boost level. There have also been numberous test that prove long tubes add power to FI combos. Don't believe everything you read and don't repost it either.

You are right in that you should not believe everything you read. However, Kenne Bell has the data to back up what they say about headers and high flow cats not helping make HP and furthermore, Kenne Bell could profit from selling headers and "high flow cats" but they chose not to. Integrity and truth is why some companies stay in business for years.


Speaking of reposts, check out kenne Bell challanging any one to a header and high flow dyno test as long as it's printed in a magazine.:eek:uttahere:

http://kennebell.net/KBWebsite/Common/pdfs/MustangCatalyticConverters.pdf
 

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You are right in that you should not believe everything you read. However, Kenne Bell has the data to back up what they say about headers and high flow cats not helping make HP and furthermore, Kenne Bell could profit from selling headers and "high flow cats" but they chose not to. Integrity and truth is why some companies stay in business for years.


Speaking of reposts, check out kenne Bell challanging any one to a header and high flow dyno test as long as it's printed in a magazine.:eek:uttahere:

http://kennebell.net/KBWebsite/Common/pdfs/MustangCatalyticConverters.pdf
I ask again, when did he mention Ferraris or Lamborghini's?
 

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Do you seriously think that the stock, very restrictive, 2 1/4" cats are the best option for a 2 1/2" system?

---------- Post added at 05:25 PM ---------- Previous post was at 05:23 PM ----------



I'm not seeing where he mentioned either Ferrari or Lamborghini.
He said that 700 hp cars can't hold cats, i said nope and gave an example of a car.


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Gonna call bs. You're saying that ferraris and lamborghinis blow cats all the time? I don't see how they could sell a car with faulty cats


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That is not what i said. My point was that metallic lasts longer than ceramic in heavy duty applications. Those high end cars may already run metallic for all I know.

Some examples of what I have read.

http://www.etrailer.com/question-23164.html

http://www.pysales.com/iw_products.m4p.pvx?;item?ItemCode=CVM13M?company=ppe

http://www.americanmuscle.com/pypes-metallic-catalytic-converter.html

http://lightspeedinnovations.rpmware.com/flowmaster/flowmaster_catalytic_converters/g-69494.aspx

Each of those sites indicate that metallic substrate is best suited for heavy duty usage. But alot of places still sell ceramic which is cheaper.

So my point to the OP was if he currently has ceramic perhaps he should look into metallic.

As for noise, use of any cat will help to tone down and reduce rasp of any exhaust setup. The honeycomb inside the cat is restrictive no matter how "high flow" it claims to be. A cat exists to clean the exhaust not flow maximum air.




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Gonna call bs. You're saying that ferraris and lamborghinis blow cats all the time? I don't see how they could sell a car with faulty cats


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Go to a Lambo dealership and find out how much their cats cost. There's a reason they cost more than your whole exhaust system.
 

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Go to a Lambo dealership and find out how much their cats cost. There's a reason they cost more than your whole exhaust system.
Because lamborghini can charge whatever the **** they want and the people who buy them will pay that.


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cats blow out due to excess fuel and build up hydrocarbons and then self igniting. It's called an un controlled regeneration. I blew a cat out on a bone stock hyundai accent after driving 5 miles with a bad coil. It plugged up and ran like crap for a week then one day a I hear a POP and my buddy behind me said I threw out a fireball. When I wen't to have a new cat installed the shop was convinced I gutted it on purpose.
 
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