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Discussion Starter · #1 ·
I get about 3 to 4 PMs each month asking me about the Kooks Green cats.

While mine have held up, I don't track the car or anything.

To put to rest the melting cat issue, had anyone managed to truly melt a set of them with a properly tuned car? If so what were the conditions and who did the tune?

I suppose it's valid to ask the same question about ARH's latest version of their cats. Both companies claim they are good for 1000+whp. But we all know real-world experience is the true test.

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My non green kooks are still fine at 675+rwhp. 20k miles


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Pat g said leaving the arh secondary cats in was a risk and advised if it isn't the green cats to have them removed. I had them cutout (probably spent way more on my exhaust then I should have but.....)

And to be honest, after removing the secondary cats the car sounds perfect. I was getting a slight drone with them in.

My headers were always catless




My headers and x pipe also didn't line up and needed a lot of work even though both are ARH. Probably spent close to 2k to get my exhaust done and I installed my headers myself.

Next time I'll just pay my fabricator to make the exhaust from headers back...

Sorry for the thread hijack rant.
 

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Discussion Starter · #4 ·
Pat g said leaving the arh secondary cats in was a risk and advised if it isn't the green cats to have them removed.
Interesting. So you had catless headers but installed ARH secondaries?

Pat tuned my car too and never mentioned the cats but I have the green cats on the headers and no secondaries.

I had them cutout (probably spent way more on my exhaust then I should have but.....)
You and me and probably almost every other forum member! Exhaust, like wheels, is largely personal preference. And unlike wheels it's hard to know what your exhaust will sound like before you do it...



And to be honest, after removing the secondary cats the car sounds perfect. I was getting a slight drone with them in.

My headers were always catless.
What's interesting about this is that you had drone WITH the cats. Usually they help temper/reduce the rasp and drone and other effects.
 

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On my phone so I can't format my responses but,

Yeah buying the mid pipe with cats was a mistake on my part, they were brand new but I didn't pay attention and they had cats on them. I think random had his fail, or the pipe fail so that was what trigger me to ask pat g about his option on then.

You're right, exhaust and wheels are terrible to get advice for because it's all preference. I'm very happy with arh back to stock mufflers but I'm sure with a different setup (less or more mods) it would change everything. I'm happy because it doesn't drone and it's not "Hey look at me" obnoxious loud, but when I get on it audible enough to know I'm not playing around.... hehe

Yeah I drove it twice with the secondary cats and hyway speeds I would get a drone. Enough it was audible to my wife but not bad enough that I had to correct it. It just so happened once I had the secondary cats removed it was completely gone.

Was an expensive endeavor but that seems on par for the hobby ;)
 

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My ARH high flow converters were great for 2 years, or around 30k miles of decently abusive driving at 15-16psi.

The pipe itself failed due to a manufacturing defect - the converters themselves were still in good shape. The only issue I had with the converters is their bullet design: it seems too easy for them to be able to get spun sideways and clog... but again it was a metal tube defect in mine.

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Discussion Starter · #7 ·
Pat g said leaving the arh secondary cats in was a risk and advised if it isn't the green cats to have them removed. I had them cutout (probably spent way more on my exhaust then I should have but.....)

And to be honest, after removing the secondary cats the car sounds perfect. I was getting a slight drone with them in.

My headers were always catless




My headers and x pipe also didn't line up and needed a lot of work even though both are ARH. Probably spent close to 2k to get my exhaust done and I installed my headers myself.

Next time I'll just pay my fabricator to make the exhaust from headers back...

Sorry for the thread hijack rant.
Hey - no sweat. I am the LAST person that would/should bitch about a thread hijack. Hell - some of my posts, even if relevant, could easily be considered a hijack!

And yes - my Kooks headers, x-pipe, and cats came as a single unit/purchase from Ben and they looks very symmetrical compared to your setup pictures above. G-Force did ALL my exhaust work, including the refits and such. Their quality of work on exhaust has always been excellent and I couldn't be happier with my car as it stands exhaust wise (well...see below lol!).

Only regret (and its a SMALL one) I have is trying something other than factory mufflers. To be honest - I LOVED the sound of the 3 inch MagnaFlow mufflers. They absolutely sounded BAD ASS. But my setup, for whatever reason, had a horrible 90Hz drone that the factory mufflers don't. But the sound was beautiful - aggressive and muscular, but not too loud or raspy. Check out the cold start and launch sounds...




And I had some v-band clamps on the exhaust right ahead of the mufflers - which was what I was hoping would be an easy way to swap mufflers in the driveway. So I could actually still try some things out to go for a different sound than the factory muffs. But that's after I fix Aldo Welds horrible HX install, repair my leaking washer tank that got destroyed by my previous meth system, get my tune dialed in, replace my wideband sensor with an OBD2 sending one, fix a gasoline smell coming in the cabin (long story - probably a small leak after a recent fuel system mod), and handle a few other odds and ends!

I can only WISH my exhaust work was ONLY $2k LOL!! But I've redone it like 3 or 4 times now to get it how I wanted.
 

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Discussion Starter · #8 · (Edited)
My ARH high flow converters were great for 2 years, or around 30k miles of decently abusive driving at 15-16psi.

The pipe itself failed due to a manufacturing defect - the converters themselves were still in good shape. The only issue I had with the converters is their bullet design: it seems too easy for them to be able to get spun sideways and clog... but again it was a metal tube defect in mine.

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Now you've got me wondering if I should swap mine out. Clearly something hit the underside of the car (there's a notable dent in one of the cats) - and my cats are actually the lowest part of the whole thing just due to the size of a 3 inch exhaust and the direction of the headers pointing down slightly. I guess I could buy either just replacement cats and have them welded in or a new x-pipe from kooks with everything ready to bolt in...I think there are connections on both ends of the x-pipe so no welding needed there and no chance the shop could get it wrong having to cut and weld in new cats. I'm gonna get a good pic and post up to see if anyone thinks my clearance is too low and/or that the exhaust could be lifted a bit. I could gain an extra inch or so - which on a car like the V is a good bit. It's not a big deal, just one of those subtle details that bug us car guys...
 

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Now you've got me wondering if I should swap mine out. Clearly something hit the underside of the car - and my cats are actually the lowest part of the whole thing just due to the size of a 3 inch exhaust and the direction of the headers pointing down slightly. I guess I could buy either just replacement cats and have them welded in or a new x-pipe from kooks with everything ready to bolt in...I think there are connections on both ends of the x-pipe so no welding needed there and no chance the shop could get it wrong having to cut and weld in new cats. I'm gonna get a good pic and post up to see if anyone thinks my clearance is too low and/or that the exhaust could be lifted a bit. I could gain an extra inch or so - which on a car like the V is a good bit. It's not a big deal, just one of those subtle details that bug us car guys...
I think cutting and welding is easier than replacing

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The problem with cutting and welding is he's going to either need to build a jig, like I had done or on the car since he has v bands and they have to be the same angle and distance.

I was sorta lucky the guy doing my exhaust gets flown all over the world to consult on custom exhaust/fabrication. His work is more art work then fabrication lol. But it's not cheap... I'm sure most shops can tackle this but with the money and the OCD I have with my car I like knowing it's not some first year shop guy cutting up my exhaust and making it work.

Here is some bonus exhaust porn...
 

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Discussion Starter · #11 ·
^^^ If I were to do something it would be to inspect/replace the one cat with a dent in the case/outer metal around the substrate and see if the whole setup could be tucked closer. I would surmise that WILL possibly involve some cutting and welding.

But if I just replace the cats, buying a new x-pipe gets me 2 new cats and it should be a simple bolt-in.
 

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Discussion Starter · #13 ·
I have seen a set of green cats fail. The car was raced frequently though ( couple times a week).
Any more details? Was in on E, 93, meth? And drag or road circuit? Any insight on power levels the car was at? I think a lot of us kinda want to know what we'd have to do to push the envelope.

And did the owner of the car contact Kooks? I'm wondering what their response would be like. I can mostly see them saying nothing they can do, but how they handle it says a lot. And if they get a failed set once in a blue moon - maybe they'd cover it or sell a set close to cost out of customer goodwill.
 

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Any more details? Was in on E, 93, meth? And drag or road circuit? Any insight on power levels the car was at? I think a lot of us kinda want to know what we'd have to do to push the envelope.

And did the owner of the car contact Kooks? I'm wondering what their response would be like. I can mostly see them saying nothing they can do, but how they handle it says a lot. And if they get a failed set once in a blue moon - maybe they'd cover it or sell a set close to cost out of customer goodwill.

Car saw lots of highway pulls along with some drag racing and road course use at 700ish whp. Never bothered to contact anyone since I wouldn't expect them to do anything about it. Just cut them out and moved on. Id say they lasted longer then other may have at a similar cell count. I could potentially see them never having a problem for a guy who doesn't race the much.

I have had one with 200cell cats live pretty much forever but those also don't really do much.
 

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They won't melt; just collapse inward. I had Kooks Green cats and removed them because they started to collapse. I bought them in 14 and checked them twice a year. Checked them early last year and saw they were starting to collapse. I decided to remove them because I was bumping up the power and wanted to be safe. I since replaced them with Vibrant Resonators to help with the sound as the Kook catless pipes were too loud and raspy. This is on a 13 ZL1.
 

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They won't melt; just collapse inward. I had Kooks Green cats and removed them because they started to collapse. I bought them in 14 and checked them twice a year. Checked them early last year and saw they were starting to collapse. I decided to remove them because I was bumping up the power and wanted to be safe. I since replaced them with Vibrant Resonators to help with the sound as the Kook catless pipes were too loud and raspy. This is on a 13 ZL1.
I want headers so bad, this thread makes the want much worse lol. I was told catless headers into the corsa axleback will be wayyyy too much though.
 

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Discussion Starter · #17 ·
They won't melt; just collapse inward. I had Kooks Green cats and removed them because they started to collapse. I bought them in 14 and checked them twice a year. Checked them early last year and saw they were starting to collapse. I decided to remove them because I was bumping up the power and wanted to be safe. I since replaced them with Vibrant Resonators to help with the sound as the Kook catless pipes were too loud and raspy. This is on a 13 ZL1.
Heh...I have the cats AND 4...yes FOUR Vibrant resonators after the x-pipe, plus stock mufflers. I guess I could pull the cats or replace them depending...
 

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I honestly don't even know why I have cats lol. Mostly because originally I wasn't planning to run e85 but things change. I think it was my early modding days in the foxbody world and the hate of showing up to where ever I was going smelling like exhaust.

My green cats are still holding up great but I really don't race it, per se. Have yet to get to the track. I do have some spirited runs but I rarely see what I'd likely trap at. With the steady diet of e85 I doubt I'd get another set of cats. If I were to somehow lose the availability of running ethanol then I'd probably worry about it. As is I'm finally happy with the sound of my exhaust so changing anything would change the tone. Speaking of which, does anyone settle with less than 3 tries at exhaust lol?

BTW, love the smell of that spent e85! And those clean tips...oh yeah. :)
 

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ARH highflows collapsed. Don't recall how many miles
Ended up punching them out just in case I ever got a visual inspection.
 
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