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⏱️ 700HP Facelift converted C63 S Coupe with Drexler 3.06 plated LSD
Originally Posted by gfang
I think it's pretty noticeable if you turn the volume up. At the very least, I can hear the difference quite clearly with headphones on. The difference in the sound is qualitative.
Yep, Prefacelift sounds like bassy AMG V8 engine sound and the other sounds like Gran Turismo.
Yep, Prefacelift sounds like bassy AMG V8 engine sound and the other sounds like Gran Turismo.
They probably introduced it because of the OPF in Europe but in the USA, as far as I what i heard, there is no OPF in the W205 C 63 S so it is unnecessary yet they kept the code? If only we can remove this line of code to disable it.
I didn't see any related components that were replaced for the FL, so theoretically speaking, you could unplug/bypass the sound generator, though I don't have one on hand to test it out on.
I didn't see any related components that were replaced for the FL, so theoretically speaking, you could unplug/bypass the sound generator, though I don't have one on hand to test it out on.
Problem is how is this done though. We can't figure it out yet.
Could someone try it and report back please? Fair to say I am not a C 63 S owner...
I was just on mbparts.mbusa.com the other day to look for a trim piece that fell off my car. So I got curious and searched for the part number for this supposed sound generator. Firstly, 205-900-69-28 has been discontinued. The new part is 205-900-21-29. Secondly, the vehicle fitment goes all the way back to the PFL, so if this is for fake engine sound, it's there in the PFL as well.
I was just on mbparts.mbusa.com the other day to look for a trim piece that fell off my car. So I got curious and searched for the part number for this supposed sound generator. Firstly, 205-900-69-28 has been discontinued. The new part is 205-900-21-29. Secondly, the vehicle fitment goes all the way back to the PFL, so if this is for fake engine sound, it's there in the PFL as well.
This wouldn't have anything to do with noise cancellation right? Don't expect noise cancellation on this vehicle.
Unless the PFL have this module just not working as actively as the facelift or maybe they changed the sound it generates.
The Burmester system does have noise cancelation to improve audio quality and for better voice recognition and quality of phone calls by cancelling out background noise. It's not the kind of noise cancelling that tries to silence the engine etc. or in the models with cylinder deactivation to cancel undesirable noise when the engine is running on 4 cylinders.
Also, for those that don't know, there is a sound that is played over the speakers during a crash to protect the occupant's ears from potential hearing damage caused by the pressure waves. It's a special sound that triggers our ears to go sort of into a protective state. I haven't researched the science behind it, but it's one of those things Mercedes does in the safety department. I don't know what other makes have this kind of tech, but it's kinda cool.
However, if it was related to this or the audio system somehow, I'd expect it to apply to other models and not just the C63. Judging from the parts information, it's unique to the C63, so my guess is as good as everybody else's guess as to what it's actually for, but it sure doesn't look like it's for fake engine sound in the FL. If it is, then the PFL has fake engine sound as well given that the part is not unique to the FL.
The Burmester system does have noise cancelation to improve audio quality and for better voice recognition and quality of phone calls by cancelling out background noise. It's not the kind of noise cancelling that tries to silence the engine etc. or in the models with cylinder deactivation to cancel undesirable noise when the engine is running on 4 cylinders.
Also, for those that don't know, there is a sound that is played over the speakers during a crash to protect the occupant's ears from potential hearing damage caused by the pressure waves. It's a special sound that triggers our ears to go sort of into a protective state. I haven't researched the science behind it, but it's one of those things Mercedes does in the safety department. I don't know what other makes have this kind of tech, but it's kinda cool.
However, if it was related to this or the audio system somehow, I'd expect it to apply to other models and not just the C63. Judging from the parts information, it's unique to the C63, so my guess is as good as everybody else's guess as to what it's actually for, but it sure doesn't look like it's for fake engine sound in the FL. If it is, then the PFL has fake engine sound as well given that the part is not unique to the FL.
Yes I heard about the Pre-safe pink noise feature, I think that was an MB patent?
Come to think of it, I remembered a thread of which a forum member heard crackle noises from their speaker when accelerating (it was a blown speaker) on a C 63 S, they unplugged something and it went away, they too suspected it was from a sound generator, this was a pre-facelift.
What about the non-Burmester equipped vehicles, without noise cancellation, how does the PFL sound? There was also that time the chip shortage that results in most FL C 63 S and GLC 63 S (even fully loaded, during that period) not have Burmester optioned.
I was just on mbparts.mbusa.com the other day to look for a trim piece that fell off my car. So I got curious and searched for the part number for this supposed sound generator. Firstly, 205-900-69-28 has been discontinued. The new part is 205-900-21-29. Secondly, the vehicle fitment goes all the way back to the PFL, so if this is for fake engine sound, it's there in the PFL as well.
I think I mentioned it in one of my above posts, but 205-900-69-28 is not included in the PFL cars. Vehicle fitment on mbparts.mbusa.com only indicates that the part can be retrofitted to the vehicle, not that it was originally included on the vehicle. For example, the vehicle dynamics control unit is not originally a component present on the PFL cars, which makes sense since the PFL cars do not have AMG Dynamics. However, both the control units for vehicle dynamics and the sound generator appear with vehicle fitment for the PFL cars on mbparts.mbusa.com. Here is one of several vehicle dynamics modules with fitment for the C63S on mbparts.mbusa.com:
The Burmester system does have noise cancelation to improve audio quality and for better voice recognition and quality of phone calls by cancelling out background noise. It's not the kind of noise cancelling that tries to silence the engine etc. or in the models with cylinder deactivation to cancel undesirable noise when the engine is running on 4 cylinders.
Also, for those that don't know, there is a sound that is played over the speakers during a crash to protect the occupant's ears from potential hearing damage caused by the pressure waves. It's a special sound that triggers our ears to go sort of into a protective state. I haven't researched the science behind it, but it's one of those things Mercedes does in the safety department. I don't know what other makes have this kind of tech, but it's kinda cool.
However, if it was related to this or the audio system somehow, I'd expect it to apply to other models and not just the C63. Judging from the parts information, it's unique to the C63, so my guess is as good as everybody else's guess as to what it's actually for, but it sure doesn't look like it's for fake engine sound in the FL. If it is, then the PFL has fake engine sound as well given that the part is not unique to the FL.
Maybe this particular one is only used in the C 63 S tuned by and to AMG specs? Maybe regular MBs have the same thing with a different part number but was programmed and designed differently?
I think I mentioned it in one of my above posts, but 205-900-69-28 is not included in the PFL cars. Vehicle fitment on mbparts.mbusa.com only indicates that the part can be retrofitted to the vehicle, not that it was originally included on the vehicle. For example, the vehicle dynamics control unit is not originally a component present on the PFL cars, which makes sense since the PFL cars do not have AMG Dynamics. However, both the control units for vehicle dynamics and the sound generator appear with vehicle fitment for the PFL cars on mbparts.mbusa.com. Here is one of several vehicle dynamics modules with fitment for the C63S on mbparts.mbusa.com:
With that being the case we are essentially back to square one of nobody really knowing what this module does and which VINs have it. While it can be fitted on a FL, it may not be standard equipment, just like the OPF is not present in some markets. Mercedes themselves said as much that it is an optional part on that other thread that was linked somewhere above. I guess it's nice to speculate at times, but nobody seems to have definitely tied this part to a specific FL VIN, or did I miss something? Fun discussion, though. I still prefer how the FL sounds .
I guess it's nice to speculate at times, but nobody seems to have definitely tied this part to a specific FL VIN, or did I miss something?
Yeah, unfortunately, Mercedes discontinued the EPC and replaced it with Xentry, so none of the third-party sites that used the EPC API can identify components present on specific FL cars by VIN. I used partsouq.com to confirm that both the sound generator and vehicle dynamics control units are not present on PFLs (or at least not present on any of the 4 PFL coupes from 2018 for the Canadian market that I tested it on), but I haven't been able to do the same with FL cars.
WIS for my 2021 C63 coupe (USA car) shows, when I hover over "230" in the diagram, part number A2059002129 (which replaces A2059006928) requires SA code "B63".
When I click on "B63" in WIS, it says it's not on my datacard.
If I hover over "230" and scroll down, there's a second part number A2389000901 (which replaces A2389008900). It also requires SA code B63, which WIS again says is not on my datacard.
So, according to WIS I have a C63 (non-S) with no "sound generator" control unit.
(Hovering over "230" in the diagram and scrolling down)
A2389000901 requires B63 which isn't in my datacard.
Yes, that's in line with what Mercedes themselves essentially said. This component is tied to a specific option that is not present on a C63. Mine doesn't have it, either. The B63 option is found on the C300 for example. It's used when you put it in Sport+. The additional engine sound is then fake sound over the speakers. I think this has been much ado about nothing.
Here's an example of a C300. You can find B63 listed on the options tab.
Yes, that's in line with what Mercedes themselves essentially said. This component is tied to a specific option that is not present on a C63. Mine doesn't have it, either. The B63 option is found on the C300 for example. It's used when you put it in Sport+. The additional engine sound is then fake sound over the speakers. I think this has been much ado about nothing.
Here's an example of a C300. You can find B63 listed on the options tab.
This is totally fake in the sense that has nothing to do with the "real amg sound" that gets pumped in they advertised on say the W206 models?
Correct. Completely synthetic. AMG Real Sound as found in the W206 captures the exhaust sound via microphones and then amplifies it through the speakers.
Correct. Completely synthetic. AMG Real Sound as found in the W206 captures the exhaust sound via microphones and then amplifies it through the speakers.
Anything they base the synthetic sound from? Some type of motor?
Anything they base the synthetic sound from? Some type of motor?
Don't really know. Given there's a sound generator, I'm guessing it's something similar to what BMW used to do or still does where it's a modulated sound sample of a real engine.
Be curious to have some of our Australian and European friends run some PFL and FL VINs to see if theirs has B63.
Last edited by superswiss; Aug 25, 2025 at 09:23 PM.
Don't really know. Given there's a sound generator, I would assume it's something similar to what BMW used to do or still does where it's a modulated sound sample of a real engine.
Be curious to have some of our Australian and European friends run some PFL and FL VINs to see if theirs has B63.
Let me see if we can find a Australian auction site or dealership group site and grab the VIN from there, although last vin and mb.vin might not be able to decode it.
Let me see if we can find a Australian auction site or dealership group site and grab the VIN from there, although last vin and mb.vin might not be able to decode it.
Im in australia and have a 2019 fl
If you send me a reputable site happy to put my vin number
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
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