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Old 11-20-2011, 07:51 PM   #15
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This is a common problem seen with hp levels starting about 600. So if your there, you might as well gut the cats and avoid any issues...
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Old 11-20-2011, 07:58 PM   #16
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This is a common problem seen with hp levels starting about 600. So if your there, you might as well gut the cats and avoid any issues...
600... Wheel or crank? Big difference and important.
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Old 11-20-2011, 08:02 PM   #17
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I running an E-Force with exhaust manifolds and stock front cats with the rear cats removed. Has anyone encountered problems with the stock cats and FI? Considering the vast majority of people are using LT headers and Hi Flow cats, I would hazard a guess that the stock cats probably have not come into question yet.
Yes, they have caused failure on a procharged G8... Different body... same car. Blew out one of the cylinders from blowback and heat buildup.

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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?
Yes, I personally know someone it happened to. Built G8, stock manifolds/cats. Wanted a sleeper... Car blew engine...
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Old 11-20-2011, 08:05 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, 08:08 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, 08:10 PM   #20
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Lawyer?
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Old 11-20-2011, 08:30 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, 08:31 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, 08:35 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, 08:40 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, 08:42 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, 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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