Exhaust options 991.2
02-23-2019, 10:51 PM
#91
Rennlist Member
Not to start a war or anything, but the cat comments are quite ignorant.
Removing a CAT will cause increased emissions of gasses that would normally be "scrubbed" by the heated cat element. Yes, it's not that good for environment...but neither are cars in general. If environmental concerns are near and dear to your heart, don't drive a 911 and advocate for reduced emissions. Get a Turbo hybrid Pan or Cayenne. Or get a Tesla and charge it solely through the Tesla solar panels.
CATs muffle the sound. Removing them increases sound. If you think removing a cat makes a car sound like an Acura, you should get your hearing checked. Sure, an Acura without a cat will probably sound like an Acura. A Porsche without a CAT won't make the 9A2 sound like a K20. It's gonna sound like a 92A, but louder.
Exhaust mods are subjective. I like em loud and I enjoy hearing the engine and it's components. Some/most people don't. It's an opinion. Don't try and force it on someone.
State facts, not opinions.
Removing a CAT will cause increased emissions of gasses that would normally be "scrubbed" by the heated cat element. Yes, it's not that good for environment...but neither are cars in general. If environmental concerns are near and dear to your heart, don't drive a 911 and advocate for reduced emissions. Get a Turbo hybrid Pan or Cayenne. Or get a Tesla and charge it solely through the Tesla solar panels.
CATs muffle the sound. Removing them increases sound. If you think removing a cat makes a car sound like an Acura, you should get your hearing checked. Sure, an Acura without a cat will probably sound like an Acura. A Porsche without a CAT won't make the 9A2 sound like a K20. It's gonna sound like a 92A, but louder.
Exhaust mods are subjective. I like em loud and I enjoy hearing the engine and it's components. Some/most people don't. It's an opinion. Don't try and force it on someone.
State facts, not opinions.
Last edited by Aatish; 02-23-2019 at 11:00 PM. Reason: I'll be nice.
02-23-2019, 10:58 PM
#92
Drifting
Perhaps a good night's sleep is in order coupled with a resolution not to call other people--other fellow Porsche enthusiasts--names? One of the things I have liked about this forum is that most people on it are gentlemen...or gentlewomen.
God bless,
TT
God bless,
TT
02-23-2019, 11:01 PM
#93
Rennlist Member
Tom's got the right idea. 
02-24-2019, 02:53 AM
#94
Not to start a war or anything, but the cat comments are quite ignorant.
Removing a CAT will cause increased emissions of gasses that would normally be "scrubbed" by the heated cat element. Yes, it's not that good for environment...but neither are cars in general. If environmental concerns are near and dear to your heart, don't drive a 911 and advocate for reduced emissions. Get a Turbo hybrid Pan or Cayenne. Or get a Tesla and charge it solely through the Tesla solar panels.
CATs muffle the sound. Removing them increases sound. If you think removing a cat makes a car sound like an Acura, you should get your hearing checked. Sure, an Acura without a cat will probably sound like an Acura. A Porsche without a CAT won't make the 9A2 sound like a K20. It's gonna sound like a 92A, but louder.
Exhaust mods are subjective. I like em loud and I enjoy hearing the engine and it's components. Some/most people don't. It's an opinion. Don't try and force it on someone.
State facts, not opinions.
Removing a CAT will cause increased emissions of gasses that would normally be "scrubbed" by the heated cat element. Yes, it's not that good for environment...but neither are cars in general. If environmental concerns are near and dear to your heart, don't drive a 911 and advocate for reduced emissions. Get a Turbo hybrid Pan or Cayenne. Or get a Tesla and charge it solely through the Tesla solar panels.
CATs muffle the sound. Removing them increases sound. If you think removing a cat makes a car sound like an Acura, you should get your hearing checked. Sure, an Acura without a cat will probably sound like an Acura. A Porsche without a CAT won't make the 9A2 sound like a K20. It's gonna sound like a 92A, but louder.
Exhaust mods are subjective. I like em loud and I enjoy hearing the engine and it's components. Some/most people don't. It's an opinion. Don't try and force it on someone.
State facts, not opinions.
Since we are on this topic, check out this awesome video here on cats
02-24-2019, 05:09 AM
#95
i have had the cargraphic stage 1 tune on my 993 turbo, included cats and muffler
02-24-2019, 02:52 PM
#96
Burning Brakes
Actually catalytic converters GREATLY reduces the harmful gases from cars. Almost night and day differences in terms amounts of pollutants released into the air. It would probably not be an exaggeration to compare a car with cats and no cats to regular cars and hybrids.
Since we are on this topic, check out this awesome video here on cats https://www.youtube.com/watch?v=lJiznlz5buc
Since we are on this topic, check out this awesome video here on cats https://www.youtube.com/watch?v=lJiznlz5buc
02-24-2019, 05:28 PM
#97
Not to start a war or anything, but the cat comments are quite ignorant.
Removing a CAT will cause increased emissions of gasses that would normally be "scrubbed" by the heated cat element. Yes, it's not that good for environment...but neither are cars in general. If environmental concerns are near and dear to your heart, don't drive a 911 and advocate for reduced emissions. Get a Turbo hybrid Pan or Cayenne. Or get a Tesla and charge it solely through the Tesla solar panels.
CATs muffle the sound. Removing them increases sound. If you think removing a cat makes a car sound like an Acura, you should get your hearing checked. Sure, an Acura without a cat will probably sound like an Acura. A Porsche without a CAT won't make the 9A2 sound like a K20. It's gonna sound like a 92A, but louder.
Exhaust mods are subjective. I like em loud and I enjoy hearing the engine and it's components. Some/most people don't. It's an opinion. Don't try and force it on someone.
State facts, not opinions.
Removing a CAT will cause increased emissions of gasses that would normally be "scrubbed" by the heated cat element. Yes, it's not that good for environment...but neither are cars in general. If environmental concerns are near and dear to your heart, don't drive a 911 and advocate for reduced emissions. Get a Turbo hybrid Pan or Cayenne. Or get a Tesla and charge it solely through the Tesla solar panels.
CATs muffle the sound. Removing them increases sound. If you think removing a cat makes a car sound like an Acura, you should get your hearing checked. Sure, an Acura without a cat will probably sound like an Acura. A Porsche without a CAT won't make the 9A2 sound like a K20. It's gonna sound like a 92A, but louder.
Exhaust mods are subjective. I like em loud and I enjoy hearing the engine and it's components. Some/most people don't. It's an opinion. Don't try and force it on someone.
State facts, not opinions.
02-24-2019, 05:44 PM
#98
Three Wheelin'
You guys are comparing extremes.
Factory cats are the most restrictive you can buy and straight pipes obviously have no restrictions at all.
The vast majority of us opt for sport cats which is a more free flowing catalytic converter that allows the engine to breath better, increase horsepower and still reduce emissions.
They aren't illegal, They pass smog tests. They arent as loud as straight pipes, but louder than stock cats.
Factory cats are the most restrictive you can buy and straight pipes obviously have no restrictions at all.
The vast majority of us opt for sport cats which is a more free flowing catalytic converter that allows the engine to breath better, increase horsepower and still reduce emissions.
They aren't illegal, They pass smog tests. They arent as loud as straight pipes, but louder than stock cats.
02-24-2019, 05:47 PM
#99
Rennlist Member
Sure it's illegal, I'm not denying that. So are tinted windows, not having a front plate, and hanging stuff of the rearview mirror...
I never called that out, and thats a good thing that you pointed it out. It's a risk. I'm ok with taking that risk. Some might not be. That's on them.
But some of the other comments made against catless, and even running after market cats, are downright ignorant; mainly those regarding sound, performance, and regarding the emissions, in some cases.
I'm trying to keep things fair and balanced; modding the emissions systems of the car has positives, though the positivity is deemed off what you value.
02-24-2019, 05:47 PM
#100
Rennlist Member
Tom, bless you for that avatar pic. Your black car from that angle stops me every time I see it. And I owe you a response from another thread—which is to say nothin' wrong with loving the factory PSE! Reading through this thread, it makes me question if that really isn't the best route. I'd like a little more voice, but not crazy about all the risk factors with aftermarket exhaust parts. There are probably only two companies I would try one from, and neither make something for the 991.2. For the time being, I'll stick with stock.
^ Thank you.
Cat delete is a morally reprehensible move on a street car. There, I said it.
Secondarily, it's illegal. I suppose one can try to compare removing a car's emissions system to other infractions like those mentioned, such as tinted windows or front plates, as "also breaking the law,'" but the difference is it's no infraction in the eyes of CARB and other entities. Shops can lose their licenses, people can lose their jobs, etc.—and anyone unfortunate enough to be following or even near a car so modified has their health affected. All so someone can enjoy "better sound" or (0-5%) "more power" in a car that was massively cleaner?
To some extent, all of us here are living in glass houses. We've all made (and will make) mistakes, but let's be honest: This isn't like front plates or "a little over." It's one of those moves that makes the whole hobby look bad, like the driver leaving Cars and Coffee sideways and into a crowd or weaving through an interstate full of minivans at 120+. We can and should do better.
Actually catalytic converters GREATLY reduces the harmful gases from cars. Almost night and day differences in terms amounts of pollutants released into the air. It would probably not be an exaggeration to compare a car with cats and no cats to regular cars and hybrids.
Since we are on this topic, check out this awesome video here on cats https://www.youtube.com/watch?v=lJiznlz5buc
Since we are on this topic, check out this awesome video here on cats https://www.youtube.com/watch?v=lJiznlz5buc
Cat delete is a morally reprehensible move on a street car. There, I said it.
Secondarily, it's illegal. I suppose one can try to compare removing a car's emissions system to other infractions like those mentioned, such as tinted windows or front plates, as "also breaking the law,'" but the difference is it's no infraction in the eyes of CARB and other entities. Shops can lose their licenses, people can lose their jobs, etc.—and anyone unfortunate enough to be following or even near a car so modified has their health affected. All so someone can enjoy "better sound" or (0-5%) "more power" in a car that was massively cleaner?
To some extent, all of us here are living in glass houses. We've all made (and will make) mistakes, but let's be honest: This isn't like front plates or "a little over." It's one of those moves that makes the whole hobby look bad, like the driver leaving Cars and Coffee sideways and into a crowd or weaving through an interstate full of minivans at 120+. We can and should do better.
Last edited by stout; 02-24-2019 at 06:14 PM.
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02-24-2019, 05:54 PM
#101
Rennlist Member
Apologies to Tom for hijacking his thread.
Let's stay on topic. If we want to duke it out regarding cat vs. catless, I'll create a separate thread.
PSE is the safe and subtle route.
There are a handful of other exhaust options, which are not as optimized for the platform...doesn't mean they're bad.
- Fabspeed X-Pipe
- Kline
- Akrapovic
- Speedtech
- GMG
- iPE Exhaust
- FI Exhaust
- Soul
Let's stay on topic. If we want to duke it out regarding cat vs. catless, I'll create a separate thread.
PSE is the safe and subtle route.
There are a handful of other exhaust options, which are not as optimized for the platform...doesn't mean they're bad.
- Fabspeed X-Pipe
- Kline
- Akrapovic
- Speedtech
- GMG
- iPE Exhaust
- FI Exhaust
- Soul
02-24-2019, 06:36 PM
#103
Rennlist Member
But I'll admit this subject gets under my skin, mainly due to the lack of good info around it (which I know you are passionate about to, even if we see it differently). I don't really have much of a problem with high-flow cats in the way I do with cat delete—but I must admit I'd like to learn more about aftermarket cats. I know there are gains in sound and power to be had, but I am curious about longevity as well as what can/could happen if the core breaks up.
02-24-2019, 06:50 PM
#104
Three Wheelin'
Stout: I love when I read these baseless claims about longevity and how aftermarket cats don't last as long or have performance benefits.
Has anyone ever heard of an aftermarket cat failing? I think I read on RL of one AM cat getting clogged and recently one factory cat getting clogged.
It just doesn't happen and to state it as fact is inaccurate. AND I am pretty sure any of the AM cat manufacturers would stand behind a failure or defect.
I'm also pretty sure that the AM cat guys all use the same cores which are of even higher quality than the factory Porsche cores.
AND how long do you expect to own your car? 3 years? 6 years? 9 years? Do you think these cats can't last 9 years?
Neither the factory 991 cats nor the aftermarket cats have been around 9 years to know, but as of now they both seem to be going strong.
The performance advantages of lower cell count cats has been proven over and over on every sports car model. Before and after dyno tests are a plenty showing HP gains.
Straight pipes provide the most increase in HP, even more than sport cats or stock cats, but that is another discussion altogether.
Has anyone ever heard of an aftermarket cat failing? I think I read on RL of one AM cat getting clogged and recently one factory cat getting clogged.
It just doesn't happen and to state it as fact is inaccurate. AND I am pretty sure any of the AM cat manufacturers would stand behind a failure or defect.
I'm also pretty sure that the AM cat guys all use the same cores which are of even higher quality than the factory Porsche cores.
AND how long do you expect to own your car? 3 years? 6 years? 9 years? Do you think these cats can't last 9 years?
Neither the factory 991 cats nor the aftermarket cats have been around 9 years to know, but as of now they both seem to be going strong.
The performance advantages of lower cell count cats has been proven over and over on every sports car model. Before and after dyno tests are a plenty showing HP gains.
Straight pipes provide the most increase in HP, even more than sport cats or stock cats, but that is another discussion altogether.
02-24-2019, 06:55 PM
#105
Rennlist Member