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      09-06-2020, 06:48 AM   #1
Jimjamz
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I'm coming off a MPE on my F80 which I was very happy with. I've heard a lot about the Remus and Akra exhausts for the CS (not sure if a M Perfornance option even exists?). I understand Akrapovic is titanium and comes with weight benefits. Is that the same for any other options? I also understand linkpipes can take further weight away and add further power (not sure about sound improvement?). I'd be interested in others' thoughts and experiences?
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      09-06-2020, 08:52 AM   #2
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It this level of tune I suspect power gains will be minimal, but you should get improved (personal taste) sound and potential weight reduction.
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      09-06-2020, 10:47 AM   #3
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Quote:
Originally Posted by medphysdave View Post
It this level of tune I suspect power gains will be minimal, but you should get improved (personal taste) sound and potential weight reduction.
Totally agree.

Akrapovic have the weight saving if the price is similar.

I saw Dinan and Eisenmann has the options. Wonder if just changing the mid pipes or just muffler would improve the sound. I also found the M2CS for be louder.
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      09-06-2020, 11:40 AM   #4
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Quote:
Originally Posted by Jimjamz View Post
I'm coming off a MPE on my F80 which I was very happy with. I've heard a lot about the Remus and Akra exhausts for the CS (not sure if a M Perfornance option even exists?). I understand Akrapovic is titanium and comes with weight benefits. Is that the same for any other options? I also understand linkpipes can take further weight away and add further power (not sure about sound improvement?). I'd be interested in others' thoughts and experiences?
Just to check: you're thinking of fitting an aftermarket exhaust to a CS, or you're looking at fitting a CS exhaust to the M2C?
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      09-06-2020, 02:27 PM   #5
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Couldn’t you use any exhaust made for an M2C?
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      09-06-2020, 02:41 PM   #6
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Here's a video of one. Sounds pretty good.

Edit: Akra on m2cs

Last edited by blitzyo; 09-06-2020 at 03:32 PM..
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      09-06-2020, 03:30 PM   #7
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Quote:
Originally Posted by M Fifty View Post
Quote:
Originally Posted by Jimjamz View Post
I'm coming off a MPE on my F80 which I was very happy with. I've heard a lot about the Remus and Akra exhausts for the CS (not sure if a M Perfornance option even exists?). I understand Akrapovic is titanium and comes with weight benefits. Is that the same for any other options? I also understand linkpipes can take further weight away and add further power (not sure about sound improvement?). I'd be interested in others' thoughts and experiences?
Just to check: you're thinking of fitting an aftermarket exhaust to a CS, or you're looking at fitting a CS exhaust to the M2C?
An aftermarket to the CS. Though wait until hearing it first in person. It was the first thing done for the S55 in the F80 and unless they've done amazing things in the last 5+ years to the stock sound am expecting to do the same again for the CS.
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      09-06-2020, 04:46 PM   #8
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I'm considering the Akrapovic with the link pipe. I just like how this exhaust sounds better than any other brand from M2C sound clips (I doubt it'd sound any different on a M2 CS). Not to mention, I just really want to get rid of that hanging muffler look as soon as I can. That way, I don't have to cut the stock exhaust. It's an easy re-install of the stock one if I ever decide it's time to sell the car. I mean... you can technically use some slip fit clamps, but it's obviously recognizable it's been altered then.
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      09-06-2020, 10:27 PM   #9
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Quote:
Originally Posted by gmhl10 View Post
I'm considering the Akrapovic with the link pipe. I just like how this exhaust sounds better than any other brand from M2C sound clips (I doubt it'd sound any different on a M2 CS). Not to mention, I just really want to get rid of that hanging muffler look as soon as I can. That way, I don't have to cut the stock exhaust. It's an easy re-install of the stock one if I ever decide it's time to sell the car. I mean... you can technically use some slip fit clamps, but it's obviously recognizable it's been altered then.
That's a good idea about not having to cut the OEM.
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      09-07-2020, 11:24 AM   #10
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Quote:
Originally Posted by Jimjamz View Post
That's a good idea about not having to cut the OEM.
Yeah, but then you have to get a tune.

https://www.akrapovic.com/en/car/pro...81&yearId=5912

Quote:
When installing the Akrapovič Evolution link pipe set, remapping the ECU is mandatory in order to prevent potential “check engine light” warning signals.
Which is strange because the M3 didn't require one.

https://www.akrapovic.com/en/car/pro...70&yearId=5052

Quote:
The complete system needs no re-programming of the ECU because it doesn’t trigger any warning lights
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      09-07-2020, 03:00 PM   #11
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Quote:
Originally Posted by ND40oz View Post
Yeah, but then you have to get a tune.

https://www.akrapovic.com/en/car/pro...81&yearId=5912



Which is strange because the M3 didn't require one.

https://www.akrapovic.com/en/car/pro...70&yearId=5052
I think the tune is to tune out the OPF DTC. The F80 M3 didn't have the OPF so that's why no tuning was required. Would likely not apply for countries that do not require OPF like the USA. Someone please correct me if I'm mistaken about this.
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      09-07-2020, 09:06 PM   #12
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Quote:
Originally Posted by gmhl10 View Post
I think the tune is to tune out the OPF DTC. The F80 M3 didn't have the OPF so that's why no tuning was required. Would likely not apply for countries that do not require OPF like the USA. Someone please correct me if I'm mistaken about this.
You are correct

No tune or changes required for cars without the OPFs
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      09-08-2020, 02:53 AM   #13
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These damn OPFs are such a pain in the ass.
They just destroy the sound and they don’t let you avoid those using aftermarket exhaust full system not doing the tune to DME.
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      09-08-2020, 11:38 AM   #14
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Quote:
Originally Posted by kart driver View Post
These damn OPFs are such a pain in the ass.
They just destroy the sound and they don’t let you avoid those using aftermarket exhaust full system not doing the tune to DME.
I read from someone who scheduled to service his M2C (2 years / 15K km) that the dealership needs his car a full day as they also are required to upgrade the DME software: rumored to be improved BMW protection of OPF/emissions levels and against tuning. The engine start should be a little quieter after the software update.

Does anyone have more info about that DME software update ?
"Digital Motor Electronics [DME]
The comprehensive management system for your engine: Digital Motor Electronics (DME) controls all key aspects of the engine's operation, ensuring optimum reliability, maximum performance and the lowest possible fuel consumption and emissions.
By managing key engine functions, Digital Motor Electronics (DME) guarantees optimum reliability, maximum performance and the lowest possible fuel consumption and emissions. It sensors continually all factors affecting the operation of the engine. The data is then evaluated by a microprocessor and translated into commands for the fuel injection and ignition systems.
The DME system receives up to 1,000 separate items of data input per second, including engine speed, air intake volume, air temperature and density, coolant temperature, throttle position, accelerator position and vehicle speed.
DME verifies all incoming data by comparing it with the reaction of the rest of the system. If a defective sensor delivers unrealistic data, DME replaces this with preset standard values. If a spark plug fails, DME immediately cuts fuel flow to this cylinder in order to prevent engine damage.
DME looks after the electrical power system too, with sensors measuring the charge and condition of the battery as well as current electrical power consumption. By maintaining optimum battery charge levels and thus avoiding flat batteries, it prevents damage to the battery and guarantees maximum battery life, thereby helping to ensure the engine always starts readily.
BMW introduced the world's first Digital Motor Electronics system in the BMW 732i in 1979."

(source: here)
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      09-08-2020, 02:15 PM   #15
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Quote:
Originally Posted by Artemis View Post
I read from someone who scheduled to service his M2C (2 years / 15K km) that the dealership needs his car a full day as they also are required to upgrade the DME software: rumored to be improved BMW protection of OPF/emissions levels and against tuning. The engine start should be a little quieter after the software update.
Say what??? I guess OG is exempt???
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      09-09-2020, 09:13 AM   #16
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Quote:
Originally Posted by ND40oz View Post
Quote:
Originally Posted by Jimjamz View Post
That's a good idea about not having to cut the OEM.
Yeah, but then you have to get a tune.

https://www.akrapovic.com/en/car/pro...38;yearId=5912

Quote:
When installing the Akrapovič Evolution link pipe set, remapping the ECU is mandatory in order to prevent potential “check engine light” warning signals.
Which is strange because the M3 didn't require one.

https://www.akrapovic.com/en/car/pro...38;yearId=5052

Quote:
The complete system needs no re-programming of the ECU because it doesn’t trigger any warning lights
Is that only if you do the link pipes? If I only got the Akra slip on is any tune required? I'd expect not?
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      09-09-2020, 09:28 AM   #17
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Quote:
Originally Posted by Jimjamz View Post
Is that only if you do the link pipes? If I only got the Akra slip on is any tune required? I'd expect not?
Yeah, the link pipes replace the section where the OPF is located on the Euro models. There's still a cat located on those pipes in the US version though.

https://www.realoem.com/bmw/enUS/sho...diagId=18_1090

But the M3 has the same setup and it doesn't require a tune, so it sounds as though the tune is specifically for the OPF like the other guys said.
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      09-12-2020, 07:59 AM   #18
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I wonder if the Dinan exhaust will fit.
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      09-14-2020, 03:21 PM   #19
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      09-14-2020, 03:33 PM   #20
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I hate to admit it, but my opinion is that a new exhaust on the M2CS is like polishing a turd. If you can get some weight reduction, then fair enough. It's just not to my liking in stock or modified form, but fortunately for me it's not a bother.
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      09-14-2020, 07:22 PM   #21
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Quote:
Originally Posted by medphysdave View Post
I hate to admit it, but my opinion is that a new exhaust on the M2CS is like polishing a turd. If you can get some weight reduction, then fair enough. It's just not to my liking in stock or modified form, but fortunately for me it's not a bother.
I got the MPE for the S55 on the F80 and it made the car. Not sure why an exhaust update wouldn't improve the CS S55's sound?
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      09-14-2020, 07:59 PM   #22
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Quote:
Originally Posted by Jimjamz View Post
I got the MPE for the S55 on the F80 and it made the car. Not sure why an exhaust update wouldn't improve the CS S55's sound?
Maybe it's just tough to capture on video. I have not heard the differences in person, so maybe it deserves reservation of judgement.
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