Secondary Cat delete on C63s Perf Exhaust
Junior Member
Joined: Aug 2020
Posts: 25
Likes: 0
2020 C63 Coupe
I just had this done yesterday to my c63s with the sports exhaust(non-pe) and the car is much more livelier. The car stock had a nice mean tone from the outside but it was barely audible from inside the cabin. I can now hear the exhaust snap and crackle with the windows up and it’s intoxicating. The sound level has increased 15-20%.
My shop replaced mine with bent 3” 304 stainless and it took roughly 1.75 hours.
Pm if you need a good shop in SoCal.
My shop replaced mine with bent 3” 304 stainless and it took roughly 1.75 hours.
Pm if you need a good shop in SoCal.
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,720
Likes: 609
From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
🔹 Hi tech mufflers in Darlinghurst: $1000
🔹 International Auto-haus in Rockdale $900
🔹 Autowerks Beverly Hills $800
🔹 Western Mufflers in Fairfield $250
You get what you pay for though and International Auto-haus is where I got mine. I chose them instead of the cheaper guys because they do all the work on my car and will do a good job without cutting your heat shield or any fu*king around.
Last edited by Jimmy_c63s; Oct 17, 2020 at 01:20 AM. Reason: Added an extra one
Newbie
Joined: Sep 2020
Posts: 4
Likes: 0
From: Sydney
W205 C63s Coupe
You've got four options.
🔹 Hi tech mufflers in Darlinghurst: $1000
🔹 International Auto-haus in Rockdale $900
🔹 Autowerks Beverly Hills $800
🔹 Western Mufflers in Fairfield $250
You get what you pay for though and International Auto-haus is where I got mine. I chose them instead of the cheaper guys because they do all the work on my car and will do a good job without cutting your heat shield or any fu*king around.
🔹 Hi tech mufflers in Darlinghurst: $1000
🔹 International Auto-haus in Rockdale $900
🔹 Autowerks Beverly Hills $800
🔹 Western Mufflers in Fairfield $250
You get what you pay for though and International Auto-haus is where I got mine. I chose them instead of the cheaper guys because they do all the work on my car and will do a good job without cutting your heat shield or any fu*king around.
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Member
Joined: Aug 2020
Posts: 114
Likes: 13
From: Sydney, Australia
2016 C63s Estate Edition 1
Hi anyone here deleted the resonator on the Performance exhaust system of 63s. Any improvement or does it make it loud? Any experience losing power/torque or drone. I know downpipes is the way to go for louder exhaust note am not just ready to pull down the Trannie. Appreciate inputs. Thank you
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,720
Likes: 609
From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
I have done this, much better sound was the result. The car was dyno'd after but that dyno also included a ECU/TCU tune so hard to gives specifics on how the 2nd Cat delete helped but in saying that, it would have improved flow, much angrier sounding, no drone and I'm certainly happy it was done.
How good is it though? Car can be so quiet when you want it to then totally transform into a riot with some downshifting and acceleration 🙉
It's rude.
Member
Joined: Aug 2020
Posts: 114
Likes: 13
From: Sydney, Australia
2016 C63s Estate Edition 1
It definitely goes harder when you nail it especially in 3rd gear all the way up to redline with exhaust open or closed, you're not imagining it.
How good is it though? Car can be so quiet when you want it to then totally transform into a riot with some downshifting and acceleration 🙉
It's rude.
How good is it though? Car can be so quiet when you want it to then totally transform into a riot with some downshifting and acceleration 🙉
It's rude.
Junior Member
Joined: Dec 2020
Posts: 44
Likes: 3
none
theres alot of good info in here on what it sounds like with the second cats gone. theres too many damn pages in this thread so i didnt read the entire thing. does anyone have any experience with doing a muffler delete on the C63?? or experience doing the second cat delete AND a muffler delete?? im wondering what it does to the sound. too raspy? too poppy? any deeper?(lower pitch) or even better than just the cat delete???
i ask becasue im coming from another car a 6.2L V8 an instead of doin a whole cat back exhaust system i just cut the mufflers out an put straight pipes to the exhaust tips. cost 0$ and REALLY wakes up the sounds of the car. def more burble an pops but it just raises the exhaust volume by alot, sounds better, deeper an more powerful overall. im wanting to see if it does the same with the C63. or if its too raspy/poppy..... any info helps thanks.
i ask becasue im coming from another car a 6.2L V8 an instead of doin a whole cat back exhaust system i just cut the mufflers out an put straight pipes to the exhaust tips. cost 0$ and REALLY wakes up the sounds of the car. def more burble an pops but it just raises the exhaust volume by alot, sounds better, deeper an more powerful overall. im wanting to see if it does the same with the C63. or if its too raspy/poppy..... any info helps thanks.
MBWorld Fanatic!
Joined: Nov 2016
Posts: 1,527
Likes: 287
From: Toronto, ON
2021 Mercedes C63s AMG Coupe
I wanted to do it, but my nearest dealership have been very honest and clear that if I do anything to do the OEM downpipe, they will unfortunately have to flag the car. They did mention it is a soft flag, in the sense they will just record it in the system I have done it. But once the car is flagged, all my warranty work will have to be approved before they can be performed.
This sounds like a massive headache just to do a secondary delete. So I have come up with another plan, I am in the process of buying a used set of pre facelift OEM downpipe. Once I have that, I will be gutting OEM Secondary CAT, but this creates it’s own issues. An empty secondary cat is going to create a lot of back pressure (counter intuitive I know). So, to get around this, I will have to weld a straight pipe into the secondary cat. Once all this is done, I will install it back into the car and not visit the dealership for a few months until the weld browns and blends. After that they should not technically have any idea.
This sounds like a massive headache just to do a secondary delete. So I have come up with another plan, I am in the process of buying a used set of pre facelift OEM downpipe. Once I have that, I will be gutting OEM Secondary CAT, but this creates it’s own issues. An empty secondary cat is going to create a lot of back pressure (counter intuitive I know). So, to get around this, I will have to weld a straight pipe into the secondary cat. Once all this is done, I will install it back into the car and not visit the dealership for a few months until the weld browns and blends. After that they should not technically have any idea.
Junior Member
Joined: Dec 2020
Posts: 44
Likes: 3
none
I wanted to do it, but my nearest dealership have been very honest and clear that if I do anything to do the OEM downpipe, they will unfortunately have to flag the car. They did mention it is a soft flag, in the sense they will just record it in the system I have done it. But once the car is flagged, all my warranty work will have to be approved before they can be performed.
This sounds like a massive headache just to do a secondary delete. So I have come up with another plan, I am in the process of buying a used set of pre facelift OEM downpipe. Once I have that, I will be gutting OEM Secondary CAT, but this creates it’s own issues. An empty secondary cat is going to create a lot of back pressure (counter intuitive I know). So, to get around this, I will have to weld a straight pipe into the secondary cat. Once all this is done, I will install it back into the car and not visit the dealership for a few months until the weld browns and blends. After that they should not technically have any idea.
This sounds like a massive headache just to do a secondary delete. So I have come up with another plan, I am in the process of buying a used set of pre facelift OEM downpipe. Once I have that, I will be gutting OEM Secondary CAT, but this creates it’s own issues. An empty secondary cat is going to create a lot of back pressure (counter intuitive I know). So, to get around this, I will have to weld a straight pipe into the secondary cat. Once all this is done, I will install it back into the car and not visit the dealership for a few months until the weld browns and blends. After that they should not technically have any idea.
MBWorld Fanatic!
Joined: Nov 2016
Posts: 1,527
Likes: 287
From: Toronto, ON
2021 Mercedes C63s AMG Coupe
Newbie
Joined: Sep 2019
Posts: 2
Likes: 2
C63
2021 with Pre-facelift downpipes
I just swapped my Edition 1 for a 2021. Can anyone please share any video representative of what their car sounds like inside and out with pre-facelift downpipes on a facelift car? Thanks.
Junior Member
Joined: Aug 2020
Posts: 25
Likes: 0
2020 C63 Coupe
I've never seen this being done on a facelift C63, might be a difficult job that is not worth it (might as well get aftermarket downpipes considering the labor cost). However, if you want a cheap OEM like way to get your car sounding like the pre-facelift, I suggest you do a secondary cat delete. I did one on mine and it really wakes the car up. I would say the sound is comparable to a stock pre-facelift.
MBWorld Fanatic!
Joined: Jun 2019
Posts: 1,453
Likes: 399
From: Flat Earth
AMG C63s Sedan , AMG C43 , AMG G63 , GLK 250
MBWorld Fanatic!
Joined: Nov 2016
Posts: 1,527
Likes: 287
From: Toronto, ON
2021 Mercedes C63s AMG Coupe
I wanted to do the secondary cat delete with the original CAT, but my nearest dealership have been very honest and clear that if I do anything to do the OEM downpipe, they will unfortunately have to flag the car. They did mention it is a soft flag, in the sense they will just record it in the system I have done it. But once the car is flagged, all my warranty work will have to be approved before they can be performed.
This sounds like a massive headache just to do a secondary delete. So I have come up with another plan, I am in the process of buying a used set of pre facelift OEM downpipe. Once I have that, I will be gutting OEM Secondary CAT, but this creates it’s own issues. An empty secondary cat is going to create a lot of back pressure (counter intuitive I know). So, to get around this, I will have to weld a straight pipe into the secondary cat. Once all this is done, I will install it back into the car and not visit the dealership for a few months until the weld browns and blends. After that they should not technically have any idea.
This sounds like a massive headache just to do a secondary delete. So I have come up with another plan, I am in the process of buying a used set of pre facelift OEM downpipe. Once I have that, I will be gutting OEM Secondary CAT, but this creates it’s own issues. An empty secondary cat is going to create a lot of back pressure (counter intuitive I know). So, to get around this, I will have to weld a straight pipe into the secondary cat. Once all this is done, I will install it back into the car and not visit the dealership for a few months until the weld browns and blends. After that they should not technically have any idea.
Newbie
Joined: Jul 2021
Posts: 12
Likes: 2
c63s amg sedan 2017
To clarify, the sound reduction in the standard W205 C63/S is:
turbos -> primary cats -> secondary cats -> valved h-pipe -> rear mufflers (valved on performance exhaust)
Options to make louder are to remove one or both cats and/or the rear mufflers. Because of the turbo adding silencing, removing the secondary cats on the W205 is akin to removing the resonator on the W204 (which went primary cats -> secondary cats -> resonator -> rear mufflers)
turbos -> primary cats -> secondary cats -> valved h-pipe -> rear mufflers (valved on performance exhaust)
Options to make louder are to remove one or both cats and/or the rear mufflers. Because of the turbo adding silencing, removing the secondary cats on the W205 is akin to removing the resonator on the W204 (which went primary cats -> secondary cats -> resonator -> rear mufflers)
MBWorld Fanatic!
Joined: Sep 2016
Posts: 1,720
Likes: 609
From: Australia
⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Here's Weistec catless downpipes as an example vs stock
Junior Member
Joined: Oct 2021
Posts: 52
Likes: 2
2020 C63s Coupe
I just had this done yesterday to my c63s with the sports exhaust(non-pe) and the car is much more livelier. The car stock had a nice mean tone from the outside but it was barely audible from inside the cabin. I can now hear the exhaust snap and crackle with the windows up and it’s intoxicating. The sound level has increased 15-20%.
My shop replaced mine with bent 3” 304 stainless and it took roughly 1.75 hours.
Pm if you need a good shop in SoCal.
My shop replaced mine with bent 3” 304 stainless and it took roughly 1.75 hours.
Pm if you need a good shop in SoCal.
Senior Member
Joined: Aug 2021
Posts: 398
Likes: 130
From: SoCal
16' C63s, 22' RAM 1500
I just got my mufflers deleted today and damn I wish it did have resonators car is stupid loud. Fml getting resonators installed soon hopefully
