With one caveat, make sure the valve actuator motor is still good too. They can burn out from too many attempts at modulating a stuck/dead valve.

there should be 3 valves on Performance exhaust. when replacing with aftermarket, only stock valve remains, which located at H pipe, it never fails, main problem with ones in actual back boxes.

Maybe, but I'm talking about motors themselves....if they fail, and they can (mine did) , swapping exhaust systems to aftermarket will not change them. They (the motors) are separate from an aftermarket exhaust upgrade.

well, might depends on system itself. speaking of my brabus cat back, it doesnt have valves on back boxes, so they are eliminated. only 1 valve remained which is on H pipe and it came new from brabus. that is a bit downside for me, as car is still loud even in comfort mode with valves closed.

Ah. Makes sense. Yes, then it will depend on the aftermarket system design. My awe system had valves in the back boxes and at the hpipe.

what aftermarket exhaust did you guys get? i thought there was no use getting one given how good the stock amg performance one is

I found a cheaper mod and problem solver to this. Before you do anything to the exhaust (Cat-Back) get the valve controller from Renntech, It allows you to open the valves 100% of the time. I got mine for $700.00 (a lot cheaper that an exhaust and about the same price as 2 OEM valve servos)

My valves were getting stuck and dealer had no way to stop it. Since I have DP they will not do the job under warranty so I decided to fix it myself. My OEM motors still worked so I got the valve controller from renntech and cleaned the vales and problem solve. Valves will remain open all the time, I get the extra sound of an exhaust system and no power loss

does this solution still work for you or have you had problems since? I was going to just wait for mine to open on my 19 C63S and then unplug them so they can’t close. Does anybody know if this will work?

so i was poking around in xentry today and i confirmed 100% that my stage 1 tune throws an exhaust flap actuator error code.

i know there's that $500 module you plug into your trunk. did we ever figure out if you can just code the flaps 100% open all of the time? my only concern is... why wouldn't we want this? will it cause power loss due to anti-backpressure or something?

edit: i asked somebody smarter than me and they said flaps always open means no power down low and bad for emissions/maybe fuel economy?

looks like exhaust flap actuators can be coded to "disabled" in amg drive control unit (not cpc), then you just manually open them yourself and they'll never autoclose again i guess

Can anyone confirm that this works? I’m doing downpipes on my E63 soon and want to get the Renntech EVM so I avoid the Valves stuck problem all together when it eventually happens.

Anyone still have this valve issue with dps and the EVM installed?

Same issue with mine no boost past 4,000 RPM and maxes out at 350ish HP. Car has perf exhaust, BOV , Downpipes and an ECU tune .

Took it to the dealer and they could not find any error codes yet the problem remained and I could show videos of O boost .

MB did a search and found that one of the actuators threw a fault code many months ago and I decided to have both the actuators changed (new MB part number so they must have made a design change); . All was good and it happened again; now same thing no boost past 4K rpm (see vid link below) .

https://www.dropbox.com/s/5toxzvabkh..._1143.MOV?dl=0

Now not sure what to do ; it looks like my 2 options are :

1) get a new exhaust
2) get the renntech or similar module

Bummed because I like the option of quiet mode and it would bum me out to have a non functioning button in my car. What do you guys think?

buy a CPC tune

i worked with tuners in america to make the exhaust flaps map fully open

trust me

I’ll check to see if my tuner can provide a CPC solution . I am not confident my MB dealer will fix the problem

dm me, i have many options available

Lead tech at my Indy shop has scoped the exhaust and found that when the car has been driven and the exhaust is warmed up the valve gets occasionally stuck . Even with the new actuators just installed at MB the stuck valve throws a soft code limiting boost. So far the valve does unstick itself eventually but this may cause the actuators to fail again .

The tech is proposing to fabricate a new guide into the valve to see if that could allow me to have the full functionality of being able to have the valves closed in comfort mode or whenever I choose to by using the exhaust button in the car.

The tech seems to think that this is a viable solution. If it does not work I’ll get a module to keep the exhaust open all of the time but this may just be a solution to keeping the stock functionality working the way it is supposed to be .

I will post updates and more details as the install and testing takes place .

**** all that

buy a cpc_ng tune

it has 1000nm+ torque limit, 360km/h vmax speed limiter, and fully open exhaust flaps

i run it on my car

it got rid of this problem 100%

I most likely will get a CPC tune but, unless I am mistaken , that will not solve the valves From sticking if I want to keep the OEM functionality Of the dash exhaust button . Am I missing something?

couple of different options

in the CPC_NG calibration file are a lot of different "maps". some of them are for comfort mode, some of them are for sport. you can ask your tuner to fully open 100% with no restrictions/intervention (which is what causes the sticking/stuckness) in the sport map and leave the comfort map alone.

let's just say i know a lot about CPC_NG tunes :P

Had the muffler taken off and one of the valve pivot points is just missing; I cannot find a replacement valve anywhere online .

Bummer MB did not notice that when they replaced both actuators . It looks like , in order to keep the stock flap control, I will need to replace the whole exhaust with a new OEM parts . Because I am afraid this may reoccur I ordered the Renntech control module as well . Video of the flap malfunction below :

https://www.dropbox.com/s/b1ubii1a2c..._8421.mov?dl=0

the saga continues ...

you guys are wasting your time asking your MB dealer to fix it

please, get a CPC tune. i did it, it's amazing. my car stage 1 is 2x as fast with CPC tune compared to without. my girlfriend said it feels like it is going to flip backwards it pulls so hard. plus more exhaust noise with flaps open. no torque limits, PDK-like quick *** shifts

eurocharged, weistec, labworx, hit up any of these companies for good ECU + TCU + CPC tuning. i promise you, you will not regret it.

I am looking for the stock functionality of the performance exhaust and to be able to open and close valves with the factory button as it is pretty loud with DP . I don't think a CPC tune will fix that for me but it will probably be one of my next mods ...

it can
you can leave the flaps closed in comfort mode and open them in sport

you can control the angle restriction, etc.

Did you do TCU tune also or just CPC? Any performance benefit from TCU tune other than higher launch RPM?

i haven't tuned my TCU yet. i'm doing a touch more research before i do. i saw in the stock file 800nm torque limits so i know for a fact it will help. i think it'll increase power by at least 15rwhp.

tell everybody on the forums: how different night and day are our cars now that we tuned ECU and CPC? mine pulls 2x as hard, what about yours?

It definitely helps (I gained 3 mph in 1/4 mile) but my excitement is a little less than yours. I think it will be a huge gain if I upgrade turbos because that is where I think the CPC tune will shine. I don’t think I’m making enough power with stock turbos to make a bigger difference. Pure turbos without CPC would be a complete waste of money I’m sure.

I bought some 20” drag radials also because all I do is spin at the drag strip. I’m testing them out for the first time next Wednesday. My MPS4S were great on street (2.7 0-60) but at strip they were only getting 3.2-3.5.