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Old 11-20-2011, 08:46 PM   #26
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So, all these supercharged cars like the ZL1 and GT500 both putting out great power, should there be many problems with te stock cars for future customers? I would assume so, because there running stock cats and not even high flows.
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Old 11-20-2011, 08:49 PM   #27
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I know what you meant. Took me a few reads and I see you fixed it
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Old 11-20-2011, 08:59 PM   #28
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He has been... been having some issues with the car. He's going to inspect his cats just incase.

We're yours plugged?
Nope...at one time we thought it might the cause of a bug we were chasing but it wasn't....they were fine but we decided to gut em anyways.....I have no emissions or sniffer in SC so why not.
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Old 11-20-2011, 09:03 PM   #29
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Thats crazy, if that can be proven i would be looking for a good lawyer. Thankfully my cats are gutted
The problem with this is, most manufacturers will only issue a warranty on THEIR parts...that's where an enthusiast needs to take care to avoid these problems by doing some research and protecting themselves...some aftermarket parts don't work well with each other.

I'm curious....do any of these Hi-flow cat's claim to be for use with FI applications?


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So, all these supercharged cars like the ZL1 and GT500 both putting out great power, should there be many problems with te stock cars for future customers? I would assume so, because there running stock cats and not even high flows.
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...
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Old 11-20-2011, 09:24 PM   #30
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The ones I know of are all FI motors( one a built stroker motor with less than 5000 miles)

In Febuary,when the TVS goes on my car the cats are gone.
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Old 11-20-2011, 10:31 PM   #31
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600... Wheel or crank? Big difference and important.
Ooops - sorry - 600rwhp
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Old 11-20-2011, 11:03 PM   #32
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No it can't bust your motor or smash valves into a piston. It could overheat a cylinder if it plugs up BUT the engine will run very poorly and you will know something is wrong....if you keep driving it that way then you get what you deserve for being stupid.

I think much of the issue is that many tuners run their FI tunes extremely RICH in order to keep the motor from detonating and therefore blowing up.....RICH......kills the cats. It isn't the cats fault...it's the tuners fault, imho.
Mine was tuned a few times, initially running a bit rich but that was corrected and we had it tuned just right.
My engine actually went; piston #6 damaged too. I've done research on my exhaust and supposed to be the best of the best from the partular vendor I used. However, I'm still going to have my CATs looked at just to make sure they're not melted.
I don't want 2nd. motor busted if this was the cause. There was no detonation, no codes, but valve bent, and hole in piston. We just assumed it was due to crappy hollow GM exhaust valves and we should have changed them along with the rest of the head assembly.
This is quite rediculous in my mind. I can't get my head wrapped around, upgrading exhaust, with HF CATS which are designed for high performance engines and they melt, blowing back into cylinders? I don't understand that logic. I've never seen a vendor quote their CATS will melt if more than x-hundred HP. There is really something very wrong with this picture, and I agree with 69 Rebel could be cause for lawuits if this is in fact causing engine issues for most people.
Might be a good idea to post brand and model of CATS everyone has to get the vendors and / or manufacturers to pipe up and let us know whats going on or how to avert this type of issue.
Buying CATS just to gut them, just to avoid a blown engine doesn't seem the way to go.
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Old 11-20-2011, 11:14 PM   #33
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It's a known problem in the Mustang community that the KOOKS high flow cats are crap.

There have been a couple people lost their motors because of them.


interesting.....cant believe it.
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Old 11-21-2011, 09:33 AM   #34
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Interesting.... I have a rattle in my left HF cat.. I've not opened the pipes to look at them though..
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Old 11-21-2011, 09:44 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, 09:54 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, 09:58 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, 10:26 AM   #38
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Does that apply to the high flows as well.
YES.
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Old 11-21-2011, 10:45 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, 11:25 AM   #40
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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.
Can you recommend brands you know that will hold up to 9.3+litres?

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Old 11-21-2011, 11:37 AM   #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, 11:43 AM   #42
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Old 11-21-2011, 11:44 AM   #43
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I don't think cats are too hard to "gut".
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Old 11-21-2011, 11:46 AM   #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, 12:03 PM   #45
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If they existed
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Old 11-21-2011, 12:35 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, 12:40 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, 01:05 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, 01:58 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, 02:39 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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