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Old 11-21-2011, 10:44 AM   #35
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Nope. Because they've been designed from the factory to handle their own power, heat, and pressures. I'm not sniping at the aftermarket when I say this...but there is an inherent advantage to OEM equipment where durability is concerned...
Hmm...That's interesting, thank you.

I wonder if these cars (ZL1 and GT500) will start to see stock cat issues when the power is raised to the levels some folks have on here 600rwhp or more). It's so true though, OEM and aftermarket parts may have two different ideas of what "quality" components are.

Now I'm trying to figure out whether I should sell my High Flow Cats (JBA) that I haven't installed yet, and just go with Mid-pipes without cats. I don't want to have future problems with the cats. Once I get them installed and have the car retuned, I plan to hit 600-650rwhp.
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Old 11-21-2011, 10:54 AM   #36
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Most Cat Converters are Sized and designed around the Cubic inches of the Engine.

In this case 6.2 Liters, they will live a Happy and Productive Life.

Add a Supercharger with Say 7-8 PSI they 6.2 Liter Engine just became 9.3 Liters which far exceeds the Cat Design which causes Overheating and Failure.

The Cats need to be Double they're current Size to handle the Additional cubic inches.

Ted.
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Old 11-21-2011, 10:58 AM   #37
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Most Cat Converters are Sized and designed around the Cubic inches of the Engine.

In this case 6.2 Liters, they will live a Happy and Productive Life.

Add a Supercharger with Say 7-8 PSI they 6.2 Liter Engine just became 9.3 Liters which far exceeds the Cat Design which causes Overheating and Failure.

The Cats need to be Double they're current Size to handle the Additional cubic inches.

Ted.
Does that apply to the high flows as well. Can some of the high flow cats on the current market handle boosted LS3's at 8-10psi? How long do high flow cats usually lasted on turbocharged or supercharged LS3's?

I wonder if it would be better to go with mid pipes w/out cats. High flows would be a waste of money if they keep blowing out all the time. I'm nervous about this and I'm on the stock cats.
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Old 11-21-2011, 11:26 AM   #38
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Does that apply to the high flows as well.
YES.
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Old 11-21-2011, 11:45 AM   #39
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Thanks Ted. Well, I guess I'm selling my high flow cats and getting mid pipes, lol.
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Old 11-21-2011, 12:25 PM   #40
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Quote:
Originally Posted by JANNETTYRACING View Post
Most Cat Converters are Sized and designed around the Cubic inches of the Engine.

In this case 6.2 Liters, they will live a Happy and Productive Life.

Add a Supercharger with Say 7-8 PSI they 6.2 Liter Engine just became 9.3 Liters which far exceeds the Cat Design which causes Overheating and Failure.

The Cats need to be Double they're current Size to handle the Additional cubic inches.

Ted.
Can you recommend brands you know that will hold up to 9.3+litres?

Last edited by calbert1999; 11-21-2011 at 12:36 PM.
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Old 11-21-2011, 12:37 PM   #41
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Can you recommend brands you know that will hold up to 9.3+litres?
If they existed
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Old 11-21-2011, 12:43 PM   #42
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Old 11-21-2011, 12:44 PM   #43
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I don't think cats are too hard to "gut".
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Old 11-21-2011, 12:46 PM   #44
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Didn't a manufacturer make cats that looked stock, but were completely gutted (maybe they were just high flows)? Was that ADM?? I can't find the link to purchase them though.
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Old 11-21-2011, 01:03 PM   #45
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If they existed
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Old 11-21-2011, 01:35 PM   #46
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Didn't a manufacturer make cats that looked stock, but were completely gutted (maybe they were just high flows)? Was that ADM?? I can't find the link to purchase them though.
It was TSP but it was for their headers...not sure if they would work with yours..depends on your headers.

Gutting a set of cats is about as hard as unzipping your fly so if you can do that then you are probably good. Many vendors sell test pipes with their headers too...no cats at all.
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Old 11-21-2011, 01:40 PM   #47
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So if my goals next week are 520 to 540 at the wheels i should not worry about my cats or high flow cats?
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Old 11-21-2011, 02:05 PM   #48
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It was TSP but it was for their headers...not sure if they would work with yours..depends on your headers.

Gutting a set of cats is about as hard as unzipping your fly so if you can do that then you are probably good. Many vendors sell test pipes with their headers too...no cats at all.
Lol, thanks man. That sounds easy enough.
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Old 11-21-2011, 02:58 PM   #49
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So if my goals next week are 520 to 540 at the wheels i should not worry about my cats or high flow cats?
I think most of the failures occured on cars above 600rwhp. But why waste the money now that we know this. Go with straight pipes, keep your stock cats for inspection time.

Plus the car sounds soooo much better without cats.
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Old 11-21-2011, 03:39 PM   #50
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So if my goals next week are 520 to 540 at the wheels i should not worry about my cats or high flow cats?
I have just north of 500 rwhp and my HF cats were melted.
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Old 11-21-2011, 03:47 PM   #51
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I guess here in Germany we're screwed with that sort of issue...
Gutting the cats is tax fraud over here

If all of that is true I'm soooo looking for some of the aftermarket guys out there to step up with a solution!

Better check mine soon...
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