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Old 11-20-2011, 09:05 PM   #18
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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.
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Old 11-20-2011, 09:08 PM   #19
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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.
Thats crazy, if that can be proven i would be looking for a good lawyer. Thankfully my cats are gutted
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Old 11-20-2011, 09:10 PM   #20
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Lawyer?
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Old 11-20-2011, 09:30 PM   #21
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Lawyer?
Yea a lawyer, if it can be proven the reason of the motor failure were the cats.
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Old 11-20-2011, 09:31 PM   #22
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shaner... how hot is your whipple getting? I have a buddy w/o cats and the whipple is cool to the touch after driving and a buddy with cats whose whipple is so hot you can see the heat coming off the hood and it burnt the hood liner. Only difference is the cats.

Look for a post from 2L82RUN... he has a good bit of knowledge about this. He was telling me...


and to quote the immortal words of Dan Kasky.... "Cats are for pussies"
I'd look at the tune...or something else because my whipple feels about the same as it did before we gutted the cats.
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Old 11-20-2011, 09:35 PM   #23
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Not cool. Shouldn't the HF cats hold up regardless? Could this be busting motors from blowback into cylinders smashing valves against pistons?
I'm going to have mine checked for sure.
Exhaust manufactures should be hearing this as most people are doing HF cats with exhaust upgrades and then SC's. If CATS aren't holding up, and most places require emissions test, then it only makes sense that cats are buiilt with better materials to hold up to the heat. Perhaps, real iron instead of melting inexpensive billet aluminum, eh?
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.
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Old 11-20-2011, 09:40 PM   #24
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I'd look at the tune...or something else because my whipple feels about the same as it did before we gutted the cats.
He has been... been having some issues with the car. He's going to inspect his cats just incase.

We're yours plugged?
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Old 11-20-2011, 09:42 PM   #25
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Yea a lawyer, if it can be proven the reason of the motor failure were the cats.
I know what you meant. Took me a few reads and I see you fixed it
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Old 11-20-2011, 09:46 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, 09:49 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, 09:59 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, 10:03 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, 10:24 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, 11:31 PM   #31
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600... Wheel or crank? Big difference and important.
Ooops - sorry - 600rwhp
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Old 11-21-2011, 12:03 AM   #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 11-21-2011, 12:14 AM   #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, 10:33 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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