Impressions after owning my C63 one month
Member
Joined: Apr 2017
Posts: 210
Likes: 20
2013 C63 Coupe
1. No I get it. Some people it doesn't bother. (see: all ears are different)
2. I get resonant frequencies. As you change things along that exhaust path however, it change the dynamics of the system. A resonator tuned for the frequencies of the stock system is surely less effective or not at all once you change other parts of it.
3. Interesting article.
4. I've never once noticed on any non-resonatored car I've ever been in the "volume cranking to 11" when a certain RPM hits. That's just silly. I've driven 10hr stretches in my car, only stopping for gas, and I didn't hear any evidence of this 'drone'. It is not fatiguing or wearing or exhausting or anything of the sort. I think people are trying to make something out of nothing. Cars have engines that make little internal explosions - what did you expect. They make all sorts of noise. So what. You can't muffle everything, and some people don't want to either.
Like I said above, it's still entirely subjective. Yes, there may be resonant frequencies that the OE resonator seeks to diminish on an OE system. That doesn't mean that those resonant frequencies are "unpleasant" "sound bad" or "drone" to every single human being on the planet.
Some people love to stand next to those rotary drag cars and revel in the noise. There's plenty of science behind the production of that 'resonant noise' too. Doesn't mean that's the end-all-be-all explanation as to why some people prefer it, some people are bothered by it, or some people are neutral about it. It is 100% an opinion. There is no science or physics that says when a certain resonant frequency of the exhaust occurs that all of a sudden human heads are going to explode. So there's a frequency - I don't hear anything but sweet music.
Sensitive-eared people who moan and complain about drone are people that I generally don't ever associate with. On purpose. So maybe I just don't want to understand this elusive phenomenon that nobody can define exactly.
What I do know is that everyone's preferences are different. That's why some don't like the headers sound, while others love it. You need to actually hear it and decide for yourself. Jim here wants more noise, but doesn't want to touch the emissions components, change the 'AMG sound', or install headers or anything that might jeopardize his warranty. The resonator delete is the ONLY thing that will accomplish his goal here. Otherwise just enjoy the stock sound. There simply aren't any other options that meet his criteria.
2. I get resonant frequencies. As you change things along that exhaust path however, it change the dynamics of the system. A resonator tuned for the frequencies of the stock system is surely less effective or not at all once you change other parts of it.
3. Interesting article.
4. I've never once noticed on any non-resonatored car I've ever been in the "volume cranking to 11" when a certain RPM hits. That's just silly. I've driven 10hr stretches in my car, only stopping for gas, and I didn't hear any evidence of this 'drone'. It is not fatiguing or wearing or exhausting or anything of the sort. I think people are trying to make something out of nothing. Cars have engines that make little internal explosions - what did you expect. They make all sorts of noise. So what. You can't muffle everything, and some people don't want to either.
Like I said above, it's still entirely subjective. Yes, there may be resonant frequencies that the OE resonator seeks to diminish on an OE system. That doesn't mean that those resonant frequencies are "unpleasant" "sound bad" or "drone" to every single human being on the planet.
Some people love to stand next to those rotary drag cars and revel in the noise. There's plenty of science behind the production of that 'resonant noise' too. Doesn't mean that's the end-all-be-all explanation as to why some people prefer it, some people are bothered by it, or some people are neutral about it. It is 100% an opinion. There is no science or physics that says when a certain resonant frequency of the exhaust occurs that all of a sudden human heads are going to explode. So there's a frequency - I don't hear anything but sweet music.
Sensitive-eared people who moan and complain about drone are people that I generally don't ever associate with. On purpose. So maybe I just don't want to understand this elusive phenomenon that nobody can define exactly.
What I do know is that everyone's preferences are different. That's why some don't like the headers sound, while others love it. You need to actually hear it and decide for yourself. Jim here wants more noise, but doesn't want to touch the emissions components, change the 'AMG sound', or install headers or anything that might jeopardize his warranty. The resonator delete is the ONLY thing that will accomplish his goal here. Otherwise just enjoy the stock sound. There simply aren't any other options that meet his criteria.
. Just as the article implies, for engines with multiple cylinders firing at the same time, drone would be less noticeable. However, with all that being said, I do AGREE with your statement that drone isn't necessarily an issue for [us]. Although I haven't experienced an M156 that's straight-piped lol!! I'm sure my opinions would change after having to deal with that sound for my drive to work lol
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From: Olathe, KS
'13 C63 AMG P31
Lower your rear seats, will increase volume by 50%.
I have heard there is some rasp (at certain rpms) when removing the resonators, from more than a couple of members.
I have the secondary cats removed w/straights in, and it is a great. 15-25% louder growl. Doesn't change the AMG sound at all.
I would say remove the secondary cats first then see if you want to do more. Definitely lower your rear seats though.
Also a tune, like other say, will help greatly.
I have heard there is some rasp (at certain rpms) when removing the resonators, from more than a couple of members.
I have the secondary cats removed w/straights in, and it is a great. 15-25% louder growl. Doesn't change the AMG sound at all.
I would say remove the secondary cats first then see if you want to do more. Definitely lower your rear seats though.
Also a tune, like other say, will help greatly.
Member
Joined: Apr 2017
Posts: 210
Likes: 20
2013 C63 Coupe
Lower your rear seats, will increase volume by 50%.
I have heard there is some rasp (at certain rpms) when removing the resonators, from more than a couple of members.
I have the secondary cats removed w/straights in, and it is a great. 15-25% louder growl. Doesn't change the AMG sound at all.
I would say remove the secondary cats first then see if you want to do more. Definitely lower your rear seats though.
Also a tune, like other say, will help greatly.
I have heard there is some rasp (at certain rpms) when removing the resonators, from more than a couple of members.
I have the secondary cats removed w/straights in, and it is a great. 15-25% louder growl. Doesn't change the AMG sound at all.
I would say remove the secondary cats first then see if you want to do more. Definitely lower your rear seats though.
Also a tune, like other say, will help greatly.
Thread Starter
Super Member
Joined: Apr 2017
Posts: 549
Likes: 85
2012 Mercedes C63 AMG S
"Jim here wants more noise, but doesn't want to touch the emissions components, change the 'AMG sound', or install headers or anything that might jeopardize his warranty. The resonator delete is the ONLY thing that will accomplish his goal here. Otherwise just enjoy the stock sound. There simply aren't any other options that meet his criteria."
This could be the right path, despite my wishes.
Jim G
This could be the right path, despite my wishes.
Jim G
Super Member
Joined: Feb 2017
Posts: 681
Likes: 90
From: SWF
2020GLC63
"Jim here wants more noise, but doesn't want to touch the emissions components, change the 'AMG sound', or install headers or anything that might jeopardize his warranty. The resonator delete is the ONLY thing that will accomplish his goal here. Otherwise just enjoy the stock sound. There simply aren't any other options that meet his criteria."
This could be the right path, despite my wishes.
Jim G
This could be the right path, despite my wishes.
Jim G
Last edited by brad65ford; May 3, 2017 at 12:17 PM.
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Joined: Aug 2011
Posts: 5,351
Likes: 1,677
From: Kitchener, ON
2010 C63 AMG
"Jim here wants more noise, but doesn't want to touch the emissions components, change the 'AMG sound', or install headers or anything that might jeopardize his warranty. The resonator delete is the ONLY thing that will accomplish his goal here. Otherwise just enjoy the stock sound. There simply aren't any other options that meet his criteria."
This could be the right path, despite my wishes.
Jim G
This could be the right path, despite my wishes.
Jim G
I don't have one and passed emissions last month.
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Joined: Jun 2008
Posts: 8,074
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From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Although your car may pass testing (non-visual), and you may think secondary cats are not required, the US government certainly thinks that they are. There is no differentiation between primary and secondary cats in the eyes of the law. Technically there are quite severe civil penalties for touching/altering/removing any emissions component. Period.
Exhibit 1: The 1990 Clean Air Act - see page 2
https://www.epa.gov/sites/production...hsysrepair.pdf
Under federal law, catalytic converters may not be removed
and replaced with "converter replacement pipes' by any person.
The 1990 Clean Air Act Amendments even prohibit private
individuals from installing "converter replacement pipes" on their
own vehicles. Anyone who installs such pipes would violate section
203(a)(3)(A) and (B) of the Clean Air Act (Act).
In addition to federal law, forty-five out of the fifty
States also have statutes or regulations which prohibit tampering
with the pollution control equipment on motor vehicles or driving
or selling such vehicles. Thus, vehicle owners who tamper with
their own vehicles may be subject to substantial penalties under
both federal and State law.
The only circumstances in which a person would be allowed to
remove a converter is if the vehicle is being shipped overseas to
an area where unleaded gasoline is not generally available.
(Vehicles traveling to Canada or Mexico are nnf; eligible for this
exemption.) In this instance the vehicle owner must have a
letter from the EPA specifically authorizing the converter
removal from the vehicle in question.
and replaced with "converter replacement pipes' by any person.
The 1990 Clean Air Act Amendments even prohibit private
individuals from installing "converter replacement pipes" on their
own vehicles. Anyone who installs such pipes would violate section
203(a)(3)(A) and (B) of the Clean Air Act (Act).
In addition to federal law, forty-five out of the fifty
States also have statutes or regulations which prohibit tampering
with the pollution control equipment on motor vehicles or driving
or selling such vehicles. Thus, vehicle owners who tamper with
their own vehicles may be subject to substantial penalties under
both federal and State law.
The only circumstances in which a person would be allowed to
remove a converter is if the vehicle is being shipped overseas to
an area where unleaded gasoline is not generally available.
(Vehicles traveling to Canada or Mexico are nnf; eligible for this
exemption.) In this instance the vehicle owner must have a
letter from the EPA specifically authorizing the converter
removal from the vehicle in question.
Last edited by BLKROKT; May 3, 2017 at 01:15 PM.
MBWorld Fanatic!
Joined: Aug 2011
Posts: 5,351
Likes: 1,677
From: Kitchener, ON
2010 C63 AMG
His criteria was not touching any emissions component.
Although your car may pass testing (non-visual), and you may think secondary cats are not required, the US government certainly thinks that they are. Technically there are quite severe civil penalties for touching/altering/removing any emissions component. Period.
Although your car may pass testing (non-visual), and you may think secondary cats are not required, the US government certainly thinks that they are. Technically there are quite severe civil penalties for touching/altering/removing any emissions component. Period.
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Super Member
Joined: Feb 2017
Posts: 681
Likes: 90
From: SWF
2020GLC63
Which of the multiple exhaust changes possible for a C63:
1. Make the soundtrack more audible and pleasing without crossing the line into obnoxious? I don't need THAT much more volume, but stock is just TOO quiet.
2. Can be done without touching the secondary cats? If I do end up doing something, I would not want to touch anything to do with emissions
and
3. Are easily and inexpensively reversible in case I don't like the change, and in case I end up selling the car in the future? (Most dealerships hate aftermarket exhausts and lower their offers on trade-in cars that have them)
Jim G
1. Make the soundtrack more audible and pleasing without crossing the line into obnoxious? I don't need THAT much more volume, but stock is just TOO quiet.
2. Can be done without touching the secondary cats? If I do end up doing something, I would not want to touch anything to do with emissions
and
3. Are easily and inexpensively reversible in case I don't like the change, and in case I end up selling the car in the future? (Most dealerships hate aftermarket exhausts and lower their offers on trade-in cars that have them)
Jim G
Senior Member
Joined: Jul 2009
Posts: 373
Likes: 41
From: DFW Texas
C63 AMG Black Series
As mentioned before.. If you want to increase the stock exhaust tone simply remove the secondary cats with straight pipes in place (Mike's power pipe). Easiest mod for a small bump in volume. If you want more sound, proceed with the 2nd setup below.
Keep in mind though, he offers two different configurations depending on what you're after.
Setup 1) Remove secondary cats? = straight pipe in place
Setup 2) Remove both secondary cats and resonator? = H pipe in place of secondary with straight pipes in place of original resonator
This was when I spoke with him about a month ago.
If you simply put a straight pipe (no H crossover) in place of secondary and resonator the tone will change. You can hear this by watching the countless YouTube videos with a quality headphone set. A lot of the posters of the videos are completely vague when it comes to the description so I recommend searching different keywords in the search field on YouTube. Personally, I do not like the sound of a full straight pipe setup from secondary cats to resonator. The lack of the H crossover makes a huge difference. Without it, it sounds unrefined, and like a truck imo. The H helps with that low end grumble.
Also, it will help if you look up the purpose of a x pipe vs h pipe and compare the sound difference. There is one! The factory resonator already has a h pipe crossover built in. Figured I would break this all down for newer members. I spent an entire weekend trying to decipher between accurate info and nonsense being spewed out.
I'm tempted to remove my resonator and add on a h pipe crossover already on my current power pipe setup (secondary cat delete), but I haven't found anyone local who has this setup. I even offered compensation as beer/lunch lol. I'd like to hear this setup in person before pulling the trigger. My offer still stands for anyone in Dallas!
Hope this helps anyone who was confused.
Keep in mind though, he offers two different configurations depending on what you're after.
Setup 1) Remove secondary cats? = straight pipe in place
Setup 2) Remove both secondary cats and resonator? = H pipe in place of secondary with straight pipes in place of original resonator
This was when I spoke with him about a month ago.
If you simply put a straight pipe (no H crossover) in place of secondary and resonator the tone will change. You can hear this by watching the countless YouTube videos with a quality headphone set. A lot of the posters of the videos are completely vague when it comes to the description so I recommend searching different keywords in the search field on YouTube. Personally, I do not like the sound of a full straight pipe setup from secondary cats to resonator. The lack of the H crossover makes a huge difference. Without it, it sounds unrefined, and like a truck imo. The H helps with that low end grumble.
Also, it will help if you look up the purpose of a x pipe vs h pipe and compare the sound difference. There is one! The factory resonator already has a h pipe crossover built in. Figured I would break this all down for newer members. I spent an entire weekend trying to decipher between accurate info and nonsense being spewed out.
I'm tempted to remove my resonator and add on a h pipe crossover already on my current power pipe setup (secondary cat delete), but I haven't found anyone local who has this setup. I even offered compensation as beer/lunch lol. I'd like to hear this setup in person before pulling the trigger. My offer still stands for anyone in Dallas!
Hope this helps anyone who was confused.
Last edited by SuckaGDog; May 3, 2017 at 01:50 PM.
MBWorld Fanatic!
Joined: Jun 2008
Posts: 8,074
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From: Los Angeles
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Title II | Clean Air Act | US EPA
United States Code: Title 42,7524. Civil penalties | LII / Legal Information Institute
§ 7522. Prohibited acts
(3)
(A) for any person to remove or render inoperative any device or element of design installed on or in a motor vehicle or motor vehicle engine in compliance with regulations under this subchapter prior to its sale and delivery to the ultimate purchaser, or for any person knowingly to remove or render inoperative any such device or element of design after such sale and delivery to the ultimate purchaser; or
(B) for any person to manufacture or sell, or offer to sell, or install, any part or component intended for use with, or as part of, any motor vehicle or motor vehicle engine, where a principal effect of the part or component is to bypass, defeat, or render inoperative any device or element of design installed on or in a motor vehicle or motor vehicle engine in compliance with regulations under this subchapter, and where the person knows or should know that such part or component is being offered for sale or installed for such use or put to such use;
§ 7524. Civil penalties:
(a) Violations
Any person who violates sections [1] 7522(a)(1), 7522(a)(4), or 7522(a)(5) of this title or any manufacturer or dealer who violates section 7522 (a)(3)(A) of this title shall be subject to a civil penalty of not more than $25,000. Any person other than a manufacturer or dealer who violates section 7522 (a)(3)(A) of this title or any person who violates section 7522 (a)(3)(B) of this title shall be subject to a civil penalty of not more than $2,500. Any such violation with respect to paragraph (1), (3)(A), or (4) of section 7522 (a) of this title shall constitute a separate offense with respect to each motor vehicle or motor vehicle engine. Any such violation with respect to section 7522 (a)(3)(B) of this title shall constitute a separate offense with respect to each part or component. Any person who violates section 7522 (a)(2) of this title shall be subject to a civil penalty of not more than $25,000 per day of violation.
United States Code: Title 42,7524. Civil penalties | LII / Legal Information Institute
§ 7522. Prohibited acts
(3)
(A) for any person to remove or render inoperative any device or element of design installed on or in a motor vehicle or motor vehicle engine in compliance with regulations under this subchapter prior to its sale and delivery to the ultimate purchaser, or for any person knowingly to remove or render inoperative any such device or element of design after such sale and delivery to the ultimate purchaser; or
(B) for any person to manufacture or sell, or offer to sell, or install, any part or component intended for use with, or as part of, any motor vehicle or motor vehicle engine, where a principal effect of the part or component is to bypass, defeat, or render inoperative any device or element of design installed on or in a motor vehicle or motor vehicle engine in compliance with regulations under this subchapter, and where the person knows or should know that such part or component is being offered for sale or installed for such use or put to such use;
§ 7524. Civil penalties:
(a) Violations
Any person who violates sections [1] 7522(a)(1), 7522(a)(4), or 7522(a)(5) of this title or any manufacturer or dealer who violates section 7522 (a)(3)(A) of this title shall be subject to a civil penalty of not more than $25,000. Any person other than a manufacturer or dealer who violates section 7522 (a)(3)(A) of this title or any person who violates section 7522 (a)(3)(B) of this title shall be subject to a civil penalty of not more than $2,500. Any such violation with respect to paragraph (1), (3)(A), or (4) of section 7522 (a) of this title shall constitute a separate offense with respect to each motor vehicle or motor vehicle engine. Any such violation with respect to section 7522 (a)(3)(B) of this title shall constitute a separate offense with respect to each part or component. Any person who violates section 7522 (a)(2) of this title shall be subject to a civil penalty of not more than $25,000 per day of violation.
Last edited by BLKROKT; May 3, 2017 at 01:53 PM.
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Joined: Aug 2011
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Likes: 395
2012 E550 Cabrio
Jim, next time I am on the Island I will look you up. I have the secondary cat delete.
That wont affect warranty, and sounds good. Just more of the same.
Around town and pulling in to your complex its pretty much the same, but get on the
loud pedal and it works.
I just replaced with straight pipe at a competent exhaust shop and it cost me $168can, tax in.
If you aren't getting a tune:
Drive in sport and sport+, that helps with the decel burble and downshifts.
Put your back seats down. That helps a lot.
And I forget who asked upthread, but Canadian cars don't come with ROW and charcoal delete.
That wont affect warranty, and sounds good. Just more of the same.
Around town and pulling in to your complex its pretty much the same, but get on the
loud pedal and it works.
I just replaced with straight pipe at a competent exhaust shop and it cost me $168can, tax in.
If you aren't getting a tune:
Drive in sport and sport+, that helps with the decel burble and downshifts.
Put your back seats down. That helps a lot.
And I forget who asked upthread, but Canadian cars don't come with ROW and charcoal delete.
Member
Joined: Apr 2017
Posts: 210
Likes: 20
2013 C63 Coupe
Tampering with any part of the system is ILLEGAL. Whether you'll actually get cited for this or whether you'll pass emissions, is a completely different story. Let's be honest with ourselves here... The only place where deleting 2nd cats would be an issue would be in a state like, California. Most states are relatively lenient when it comes to yearly or bi-yearly inspections. If there are no CELs and/or out-of-range carbon levels, you'll more than likely pass state inspection. As BLKROKT stated, the significance of removing these cats are minimal. Honestly, the only times you would run into problems LEGALLY would be in the event of a "significant incident" where causes for the aforementioned "incident" were being "investigated." The extent of an "incident" can be as small as a muffler infraction, which is simply a civil violation, resulting in a fine of a few hundred bucks...
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Joined: Aug 2011
Posts: 5,351
Likes: 1,677
From: Kitchener, ON
2010 C63 AMG
Maybe Canada is different. But in the US, it's pretty clear. I know we all like the secondary cat delete, and that it doesn't really make any difference, at least in testing. But it's not there for show. Your car is illegal if ANY of the emissions equipment that originally came on the vehicle from the manufacturer is not working properly or missing. And the secondary cat, whether it's metered or not, is "emissions equipment". Full stop. There's no debate about this.
Tampering with any part of the system is ILLEGAL. Whether you'll actually get cited for this or whether you'll pass emissions, is a completely different story. Let's be honest with ourselves here... The only place where deleting 2nd cats would be an issue would be in a state like, California. Most states are relatively lenient when it comes to yearly or bi-yearly inspections. If there are no CELs and/or out-of-range carbon levels, you'll more than likely pass state inspection. As BLKROKT stated, the significance of removing these cats are minimal. Honestly, the only times you would run into problems LEGALLY would be in the event of a "significant incident" where causes for the aforementioned "incident" were being "investigated." The extent of an "incident" can be as small as a muffler infraction, which is simply a civil violation, resulting in a fine of a few hundred bucks...
For Ontario --> https://www.ontario.ca/laws/regulation/980361
I recall reading that any non metered component (after the secondary O2 sensor) is not considered part of the emissions system.
Potential legal loophole?
Thread Starter
Super Member
Joined: Apr 2017
Posts: 549
Likes: 85
2012 Mercedes C63 AMG S
Jim G
Thread Starter
Super Member
Joined: Apr 2017
Posts: 549
Likes: 85
2012 Mercedes C63 AMG S
As mentioned before.. If you want to increase the stock exhaust tone simply remove the secondary cats with straight pipes in place (Mike's power pipe). Easiest mod for a small bump in volume. If you want more sound, proceed with the 2nd setup below.
Keep in mind though, he offers two different configurations depending on what you're after.
Setup 1) Remove secondary cats? = straight pipe in place
Setup 2) Remove both secondary cats and resonator? = H pipe in place of secondary with straight pipes in place of original resonator
This was when I spoke with him about a month ago.
If you simply put a straight pipe (no H crossover) in place of secondary and resonator the tone will change. You can hear this by watching the countless YouTube videos with a quality headphone set. A lot of the posters of the videos are completely vague when it comes to the description so I recommend searching different keywords in the search field on YouTube. Personally, I do not like the sound of a full straight pipe setup from secondary cats to resonator. The lack of the H crossover makes a huge difference. Without it, it sounds unrefined, and like a truck imo. The H helps with that low end grumble.
Also, it will help if you look up the purpose of a x pipe vs h pipe and compare the sound difference. There is one! The factory resonator already has a h pipe crossover built in. Figured I would break this all down for newer members. I spent an entire weekend trying to decipher between accurate info and nonsense being spewed out.
I'm tempted to remove my resonator and add on a h pipe crossover already on my current power pipe setup (secondary cat delete), but I haven't found anyone local who has this setup. I even offered compensation as beer/lunch lol. I'd like to hear this setup in person before pulling the trigger. My offer still stands for anyone in Dallas!
Hope this helps anyone who was confused.
Keep in mind though, he offers two different configurations depending on what you're after.
Setup 1) Remove secondary cats? = straight pipe in place
Setup 2) Remove both secondary cats and resonator? = H pipe in place of secondary with straight pipes in place of original resonator
This was when I spoke with him about a month ago.
If you simply put a straight pipe (no H crossover) in place of secondary and resonator the tone will change. You can hear this by watching the countless YouTube videos with a quality headphone set. A lot of the posters of the videos are completely vague when it comes to the description so I recommend searching different keywords in the search field on YouTube. Personally, I do not like the sound of a full straight pipe setup from secondary cats to resonator. The lack of the H crossover makes a huge difference. Without it, it sounds unrefined, and like a truck imo. The H helps with that low end grumble.
Also, it will help if you look up the purpose of a x pipe vs h pipe and compare the sound difference. There is one! The factory resonator already has a h pipe crossover built in. Figured I would break this all down for newer members. I spent an entire weekend trying to decipher between accurate info and nonsense being spewed out.
I'm tempted to remove my resonator and add on a h pipe crossover already on my current power pipe setup (secondary cat delete), but I haven't found anyone local who has this setup. I even offered compensation as beer/lunch lol. I'd like to hear this setup in person before pulling the trigger. My offer still stands for anyone in Dallas!
Hope this helps anyone who was confused.
Jim G
Thread Starter
Super Member
Joined: Apr 2017
Posts: 549
Likes: 85
2012 Mercedes C63 AMG S
i want to remind everyone that my concern is my FOUR YEAR aftermarket WARRANTY, not emissions testing. I don't want the warranty company to have a plausible excuse to challenge a repair claim.
Jim G
Jim G
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From: Kitchener, ON
2010 C63 AMG
Thread Starter
Super Member
Joined: Apr 2017
Posts: 549
Likes: 85
2012 Mercedes C63 AMG S
This explains why the absence of the secondary cat won't cause an emissions TEST failure, as those tests are always conducted when the engine is at normal operating temperature, not cold.
Jim G
MBWorld Fanatic!
Joined: Aug 2011
Posts: 5,351
Likes: 1,677
From: Kitchener, ON
2010 C63 AMG
Not technically according to the system design loop.
Some vehicles have a secondary cat before the secondary 02 which is metered and part of the monitored system emissions.
The resonator AND mufflers "technically" affect emissions. So are they now considered an emissions component?
Some vehicles have a secondary cat before the secondary 02 which is metered and part of the monitored system emissions.
The resonator AND mufflers "technically" affect emissions. So are they now considered an emissions component?
