I ordered this for my 2018 AMG GT C Edition 50: https://www.active-sound.eu/de/merce...appensteuerung

It was a fairly easy install but the Cete Active Valve Control module isn't working. I don't know if I got a defective one, or something can be fixed. Getting tech support from Cete is like using Morse code with two cans pulled between a tight string. At this point I regret my purchase as I hoped for a simple plug-and-play result and for the module to work as advertised. I got the one but not the other. I understand there is a language difference, but even given that I still rate the tech support a 3 out of 10 at this point. If anyone has a success story with an AMG GTC and the Cete AVC (Active Valve Control), I'd love to hear it to bolster my hope for a successful outcome.

Mine works fine. Was a head scratcher to figure out where to even begin the installation but once I figured it out, everything went pretty easy. Good luck.

What model do you have? Do you already have the sport exhaust button?

2020 GTR which has the button.

Can you describe for me how it is different than stock? Do you always get a louder start? Can you return to stock by double pressing the ESP button. Neither of those are working for me.

I had this module on my 16 GTS and loved it. You will know when it is working because it totally changes the sound, especially at idle. My mechanic had some trouble getting it to work at first and the issue was getting power to the module via the red wire. Make sure you have a good connection there. Yours could be different since mine was a 16 but it's definitely worth figuring out. Car sounds amazing with it!

Thanks so much for the positive testament! Mine is definitely not working so I guess that's good because I want what you have.

does it open the valves further than stock or just keep them open more often?

https://www.active-sound.eu/de/merce...appensteuerung

From what I understand the valves adjust based on throttle. So stock factory settings don't fully open the valves just by pressing the exhaust button. With the cete module when you press the button the valves fully open so you will hear the biggest difference at idle and just cruising speed. At WOT I believe it will sound the same as stock.

That's how I understood it. Someone can correct me if I got anything wrong.

That's what I understood, what I hoped, and why I bought it. Unfortunately it's just not true for me. At least with a 2018 GTC that already has the sport exhaust. For a warm start there is almost no difference between when the module is activated and when it's original. Right now I'm looking at this purchase as a waste of time and money. I'm guessing if you have a GTS without the sport exhaust button, it probably makes a big difference.

Sorry, I think that is incorrect. The module is for the sport exhaust (which I had) and adjusts the valves. I'm pretty sure non-sport exhaust doesn't have valves so the module would be useless. I don't know how much the 2018 would differ from my 16 but I would guess based on your experience that you have a bad module or something isn't connected quite right. Maybe someone else with a 2018 could chime in. Since you already bought the module I think it's worth trying to figure it out. The difference was night and day. Just my two cents. Good luck!

All of the GT lineup, except the base GT, came standard with the valved exhaust. If you had a base GT without the valved exhaust, then the module would do nothing for you, as you'd not have valves to open/close.

It's installed correctly. I've asked for a return authorization. I don't want to argue, but one of their support people just wrote this to me which I think pretty much settles it. "The IDLE noise might be NO difference in 2018 GTC . . ." The Cete module does not make a material difference for start up and idle - which is why I got it. So much for "complete control."

Wow that's a bummer. Like you, I think most people who buy it are looking for better sounding start up/idle/cruising speed.

Something is not right. Mine rumbles at start up, idle and normal rpm's. Very happy with how it makes the car come alive. Very noticable difference all the way around.

That was my initial thought as well. My experience was the same as yours...car sounded amazing.

Disconnect your battery cables for one hour and try it again Andrew.

Reset man

I have the ASR module on my 2018 GT-C and it completely changes the tone of the exhaust even at idle. You can easily tell when it has the valves open vs. stock.

My experience with the sound is exactly as this video shows:
https://m.youtube.com/watch?v=hnML6n...ture=emb_title

the ASR/Renntech is different from the Cete module in that whatever setting I put it in the car stays in the setting. My stock exhaust valve button does nothing to the sound when pressed (lights still turn on/off but do nothing)

with the Cete module you still control the valves with the stock exhaust button so to get the great aggressive start sound you have to turn on the car, push the exhaust button, and then start the engine every time. The asr module keeps the valves open and I never have to push an exhaust button since I leave the exhaust open all the time.

I've returned the Cete module. Didn't do anything for me. Please see my previous reply where their support person admits that there is no difference (at least on a 2018 GTC) at idle and startup. Water under the bridge now. I've moved on and am now going to have the resonators deleted. That should do the trick.

No difference at all even in their own video

Anyone install this recently? I see people in this thread mentioning that the Cete implementation makes no difference at start-up and idle, but that makes no sense when you read the functionality of the product. Perhaps they are not switching the exhaust on before fully starting up? I am thinking this might be the case, especially when you have other people with the same product saying that it does make a big difference at start-up and idle.

From reading over hundred of posts and my own personal experience this is my verdict; any module won’t do too much on 2018 models as sound from factory is almost maxed out. My ASR module does give me warm/cold open valve starts which makes it worth it to me.

I respectfully disagree. I installed the Cete module on my 2018 and it made a difference. Apparently, the exhaust flaps only partially open when the exhaust button is pushed until you reach around 4000 or so RPMs stock. With the Cete module they are fully open from idle when the exhaust selection is on. With the Cete, it's noticeably louder at idle and low RPMs. This has been discussed on other threads. Hope this helps.