shaungrey

Hi everyone, have a new 2021 with the optional exhaust but it is so much quieter at low revs compared to my 2018. I’m in North America, any way to bypass the exhaust valves other than renntech out here. Some previous threads which are a few years old mentioned the simple electronic bypass plugs might not work on the 2019 and up facelift model. Any options that work specifically on a 2021 other than Renntech or ASR which is in Europe?
thanks!

W205C43PFL

Try this, this guy has a 2019 C43 facelift.

shaungrey

Thank you, that’s the ASR module I mentioned and only seems to be available in Europe. I’m looking for something available in North America.

DirtyDD

Unfortunately the facelift exhaust is much quieter. BMS sell a mega cheap module that leaves the PE flaps wide open all the time.

W205C43PFL

My bad, sorry about that, I just re-read your post and I remembered you mentioned Renntech but turns out I didn't even notice you mentioned ASR as well. Sorry about that. Is it possible to disconnect the controller to the valve (in anyway) and then manually keep it open all the time? However, I understand why you would want it to be quiet at times....

shaungrey

I saw this mentioned in some old posts. It seemed there might be changes with the way the face lift exhaust is controlled that render this incompatible. I’ve sent them an email directly to them find out.

shaungrey

its all good! One thread mentioned that could possibly disconnect on facelift without getting a soft code, but nothing definite. Others stated that pre facelift would definitely throw a soft code. I would rather avoid throwing a code and having to have it cleared at dealer! Has anyone else tried disconnecting the sensor connector on a facelift without getting a soft code?

DirtyDD

never heard of that. i think it works just fine.

W205C43PFL

Hmmm I know that disconnecting the OPF in a car equipped like the ones in Europe will throw a CEL but I never heard anything about exhaust valves. As for the soft code, I am thinking a good OBD scanner allows you to clear it but I fully understand why you don't want to mess with that. I don't have a facelift so I apologize I can't test it for you to see if it will throw a code.
I am wondering if you should modify the exhaust like for example do a resonator or muffler delete or both? That being said, since you have the amazing PE I don't usually recommend doing that unless cars were not equipped with PE.

AhEmGee

You can't really disconnect the OPF. It has to be removed or gutted.
Mine is gutted and my car is tuned ( also decat and Wagner)
however when I have ran the car on stock map no cel appeared.
There are sensors fore and aft of the OPF, but I think their job is only to detect if it's blocked ( is huge negative airflow measurement) rather than too much air flow ie when gutted.

W205C43PFL

Gotcha, thanks for the information and thanks for sharing your experience with this whole process I guess everything is going well for your car, enjoy it!

AhEmGee

I guess if you're from US then it's something you won't need worry about now anyway .
In Europe pretty much all new petrol cars have them since 2019.
The only exception are the Lambo Aventador and Huracan , are they got them classified as revisions of older models so they got around it.

W205C43PFL

Ya I think Lambo's fleet emission average is low enough for them to not be forced to use an OPF.
I'm not from the USA but the neighbouring country. We do follow the States' practices when it comes to cars though so we don't have the OPF either. However, even without it, the cars arriving here are much quieter than before it almost felt like we have it.

SilverBullet18

@shaungrey you can unscrew the actuators from the exhaust, re-route the wires back into the trunk and replug the actuators to the wires while in the trunk, and leave them in there.

Boom= 100% open all the time with no engine lights or anything like that and its free. seen it done.

shaungrey

Thanks for the info! Might have to give that a shot this Spring!

W205C43PFL

Curious OP, did you do that and how do you like it?

W205C43PFL

@shaungrey OP, it seems like you can use a forwarding service and order directly from the ASR website and have it shipped there and the forwarding service will then ship to Canada I am not sure if the sound will change much for a Canadian facelift you have (assuming your public profile you stated showing you are from Canada is correct) as there are no OPF for North American vehicles from what I read.
This is the link I would use for the facelift:
https://asr-component.de/de/startsei...te-typ_1_typ_2