GT/C192/R192: Exhaust Options
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Joined: Nov 2001
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
There is a little bit more rumble in C and S (closed Valve modes) at start up but nothing material. And there is no drone on the expressway in any mode.
Administrator
Joined: Nov 2001
Posts: 12,263
Likes: 901
From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
Member
Joined: Sep 2018
Posts: 154
Likes: 21
24 AMG GT55
Just call me the crash test dummy --- I went to my local exhaust shop who has done alot of resonator and 2nd cat deletes for me on my M's. He doesnt have the cleanest welds but this isnt a beauty contest and I never had any leaks.
Anyways he looked over the rear oem section (mufflers) and said he could create a "Y" design where the valves would remain so I said why not.
What he did was replace the muffler with Y section using a wider inner pipe (no valve) than oem and then split the Y to valve side. How does it sound? MORE of the same great throaty V8 rumble with pops and bangs that are more accentuated. The best way to describe the car is its the same tone but with maybe 25% more decibels or volume UP
Its a simple and reversable process too. I still cant get the valves to open fully pre higher rpms (3500 to 4k) as thats a program with the CAN but a VC will fix that. But for the price (350) its worth it to me 100%. I dont think the Renntech mufflers would that much of a gain if this gets me about 25% more with no muffler. Oh no CEL.
Powerwise, zero change in feel although the more free flow could have a tiny gain = negligible at best IMHO. But I didnt do it for that.
AFTER (Valved section is outer) The set up is more of a straight back direction vs the OEM muffler which passes out the side and then back.
BEFORE
Anyways he looked over the rear oem section (mufflers) and said he could create a "Y" design where the valves would remain so I said why not.
What he did was replace the muffler with Y section using a wider inner pipe (no valve) than oem and then split the Y to valve side. How does it sound? MORE of the same great throaty V8 rumble with pops and bangs that are more accentuated. The best way to describe the car is its the same tone but with maybe 25% more decibels or volume UP
Its a simple and reversable process too. I still cant get the valves to open fully pre higher rpms (3500 to 4k) as thats a program with the CAN but a VC will fix that. But for the price (350) its worth it to me 100%. I dont think the Renntech mufflers would that much of a gain if this gets me about 25% more with no muffler. Oh no CEL.Powerwise, zero change in feel although the more free flow could have a tiny gain = negligible at best IMHO. But I didnt do it for that.
AFTER (Valved section is outer) The set up is more of a straight back direction vs the OEM muffler which passes out the side and then back.
BEFORE
Administrator
Joined: Nov 2001
Posts: 12,263
Likes: 901
From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
Do you notice much of a difference with the valves closed vs open? Looking closer at your layout I’m wondering if there’s not much of a difference between the two. Going to a muffler shop today and may just show them your pics and have them replicate it but also wondering how a straight pipe to the valved section with the offshoot to the second one would sound.
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Junior Member
Joined: Feb 2025
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Likes: 1
So is the consensus that there is no way to get aftermarket downpipes (either with or without catalytic converters) without having a permanent CEL? I was wanting to get downpipes before a dyno tune if possible (still waiting to hear if the 2025 ECU can be unlocked for the GT 55)
Administrator
Joined: Nov 2001
Posts: 12,263
Likes: 901
From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
So is the consensus that there is no way to get aftermarket downpipes (either with or without catalytic converters) without having a permanent CEL? I was wanting to get downpipes before a dyno tune if possible (still waiting to hear if the 2025 ECU can be unlocked for the GT 55)
Junior Member
Joined: Feb 2025
Posts: 21
Likes: 1
my local Benz master tech said the DME's are hard to unlock and then their is lack of demand (he tunes a **** load of Benz cars over decades). So you can do the dps but I dont see any readily available validated tune so the CEL will prevail; plus doing dps is a load of work (drop the tranny).
Administrator
Joined: Nov 2001
Posts: 12,263
Likes: 901
From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
Based on my research no.... but thats my investigation based on the M177/178 engine.
Junior Member
Joined: Feb 2025
Posts: 35
Likes: 19
From: The Windy City
2025 GT 55
Does anyone know anything about this Capristo Exhaust for our car?
https://capristoexhaust.com/products...41804271124578
Thanks!
https://capristoexhaust.com/products...41804271124578
Thanks!
Junior Member
Joined: Sep 2022
Posts: 59
Likes: 36
From: Montreal
2022 SL 63
Good sir, would you be able to share a video/audio of your car?
Looking to do the same thing on my R232, but the general moto seems to be done do muffler deletes ever... however, this thing with the the cats being together restricts us from any full blown fix. I already have the EVM, but would lvoe to hear the tone of the muffler delete and the level of dronyness before pulling the trigger. thanks
Looking to do the same thing on my R232, but the general moto seems to be done do muffler deletes ever... however, this thing with the the cats being together restricts us from any full blown fix. I already have the EVM, but would lvoe to hear the tone of the muffler delete and the level of dronyness before pulling the trigger. thanks
Junior Member
Joined: Jun 2023
Posts: 18
Likes: 5
AMG GTR, SL63,SLSAMG
Disapoint!!
Good suggestion on the Valve Controller! That might be a good place to start...
I love this car, but if definitely needs some more exhaust noise.
I test drove a previous generation GT-R and almost bought that, it was amazing! But it wouldn't have been as good of a daily, it lacked a Heated Steering Wheel and AWD, both nice to have for Chicago Winters, and also the tech on the screens was pretty dated. I really like the features and the tech in this new one, for a daily driver.
But the exhaust sounds on the GT-R were terrific, I need more sounds like that in my GT 55!
I love this car, but if definitely needs some more exhaust noise.
I test drove a previous generation GT-R and almost bought that, it was amazing! But it wouldn't have been as good of a daily, it lacked a Heated Steering Wheel and AWD, both nice to have for Chicago Winters, and also the tech on the screens was pretty dated. I really like the features and the tech in this new one, for a daily driver.
But the exhaust sounds on the GT-R were terrific, I need more sounds like that in my GT 55!
GTR & AMG GT 55
GTR & AMG SL 63
