[StLuis51]

Originally Posted by GreatWhiteM2

I hope that isn't the finished article? That gap between the diffuser and the top off the tailpipes is massive.

??

Yes I am definitely noticing it now. I will talk to Eisenmann and see what they say.

[StLuis51]

Originally Posted by Bloodynine

I would really like to hear the exhaust sound clips!

Can you confirm if you are using the mid pipe that deletes the OPFs as well as the valved slip on (muffler) and if so, what tuning did you have to do to not get a cell warning?

Yes I am using their mid pipes, but my car is a U.S. spec and it does not come with OPFs. My muffler is valved. I didn't have to do any tuning. Eisenmann said no CEL either after install.

[Advanced]

would love to hear the race version + midpipe combo!!

[StLuis51]

I made a sound clip on my phone and uploaded it to my laptop. I have no idea how to upload it here. iPhone video now on a MacBook Pro.

[Twinsturbo]

youtube!

[StLuis51]

Sound clip uploaded finally!

[MR.]

Where are the burbles? Did you put it in sport plus mode?

Is this valve open or closed? Looks like open

MR

[ICantDrive4Sht]

Originally Posted by MR.

Where are the burbles? Did you put it in sport plus mode?

Is this valve open or closed? Looks like open

MR

Maybe tuned away, thank god. The stock burbles are horrible imo

[Commanderwiggin]

Originally Posted by ICantDrive4Sht

Maybe tuned away, thank god. The stock burbles are horrible imo

Thank god is right! Burbles are the worst for this car...BMW needs to have their head checked for enabling any of this feature.

[ashtaron14]

According to the video description

Short video of my Eisenmann exhaust. First revs are in comfort mode with closed valves and the second part is in sport plus mode with open valves.

If putting on this exhaust eliminated the burbles, I'm so down for one of these!

[MR.]

Originally Posted by ashtaron14

According to the video description

Short video of my Eisenmann exhaust. First revs are in comfort mode with closed valves and the second part is in sport plus mode with open valves.

If putting on this exhaust eliminated the burbles, I'm so down for one of these!

You don't eliminate burbles with an exhaust... That is related to the tune on your car. Burbles are not "created" by the exhaust

MR

[StavsM2C]

Originally Posted by MR.

You don't eliminate burbles with an exhaust... That is related to the tune on your car. Burbles are not "created" by the exhaust

MR

Exactly and this vehicle is justt eh STD Eisenmann exhaust not the race version...I need to hear the Race version asap!

[Advanced]

Originally Posted by StLuis51

Sound clip uploaded finally!

is this with the Eisenmann midpipe or only the rear section?

[StLuis51]

Originally Posted by Advanced

is this with the Eisenmann midpipe or only the rear section?

It has the midpipe as well.

[MR.]

Originally Posted by StLuis51

It has the midpipe as well.

On a German car? You are taking a massive risk. How are you gonna get it through the TuV?

As far as I heard this is a criminal tax offense in Germany and could get you jail time if you remove the OPFs and run a non-homologated set up illegally.

Of course, it could be you know someone at the TuV that is able to let you have this set up.

MR

[StLuis51]

Originally Posted by MR.

On a German car? You are taking a massive risk. How are you gonna get it through the TuV?

As far as I heard this is a criminal tax offense in Germany and could get you jail time if you remove the OPFs and run a non-homologated set up illegally.

Of course, it could be you know someone at the TuV that is able to let you have this set up.

MR

Yes I am aware but I will be leaving Germany before needing another inspection. The car will be shipped back to the states around August 2019.

[StLuis51]

Sound video of mine Eisenmann sport exhaust and x mid pipe.

[Pete H]

Sounds great, did you resolve the question about the gap between the top of the tail pipe and the diffuser? Is it the same as stock, looks like the pipes maybe a little bit lower?

[Cycle Pilot]

Does anybody have any video, sound clips or opinions about the Eisenmann mid pipe paired with the stock axle back? I've heard clips of the AA mid pipe but not of the Eisenmann yet.

[MR.]

Originally Posted by Cycle Pilot

Does anybody have any video, sound clips or opinions about the Eisenmann mid pipe paired with the stock axle back? I've heard clips of the AA mid pipe but not of the Eisenmann yet.

Yes I made one today. Full cat-back system on a manual M2C from one of our members here. Comparison video with my cat-back Akrapovic system coming up soon. I need to edit the clips into a single video and we will share our thoughts after hearing it.

MR

[MR.]

Originally Posted by Pete H

Sounds great, did you resolve the question about the gap between the top of the tail pipe and the diffuser? Is it the same as stock, looks like the pipes maybe a little bit lower?

Seen it today and the system is hanging way too low. Driving behind it and it doesn't look good. Something is off. We checked the difference with the Akrapovic system and the tailpipes of the Eisenmann are hanging at least a 1 cm lower.

I could put two fingers between my Akrapovic end pipes and the rear diffuser, and with the Eisenmann it was more than three. I think you might be able to change it and put it higher, but this was the prototype similarly to what my set up is, so Eisenmann might already have corrected it for future systems.

Also the aligning of the end pipes is wrong. The outer ones need to be sticking out more outwards, but that is something you can do quite easily change, I believe. All in all, just minor adjustment to make the fitting OK.

MR

[MR.]

As discussed over the weekend, Luis (StLuis51) and I have made a comparison of our exhaust systems. Both are prototypes and both have been fitted to different types of cars. Mine is a EU-spec M2C with a DCT and it is outfitted with the Akrapovic Slip-On plus Linkpipe making it a full cat-back system, and Luis has a US-spec M2C with a manual with the full cat-back system from Eisenmann with the normal end damper.

The video below shows the difference between both exhausts. First of all, we compared a static rev in valve closed and valve open mode. The clear difference between the systems in all modes is the tone. The Eisenmann is a lot higher pitched. The high pitch tone on the overrun is a lot louder than the Akrapovic exhaust and when you rev it to the max it even hurt my ears when I was just standing 2 meters from it. It is that loud valves open.

The main reason is the way the exhaust is build. You will see on the Eisenmann that all four pipes come from the same end damper. The Akrapovic has a bypass for the outer two pipes. These pipes are valved, while the Eisenmann has both inner pipes valved. This is where the main difference lies between valve closed mode on the Akrapovic and on the Eisenmann. The Akrapovic is almost as silent as stock when the valves are closed. The Eisenmann screams at you even if the valves are closed.

From a sound level point of view we would be looking at like level 7 valve closed with the Akrapovic, level 10 with the Eisenmann. When the valves are open, it becomes level 12 with the Akrapovic and 13 with the Eisenmann. The Eisenmann always feels a touch louder due to its higher pitched tune with higher revs, even though the dB value seems to be quite similar. In the end, the camera did not really pick up that high pitch sound track.

On the subject of the burbles, the Akrapovic takes the win. The sound track of the Akrapovic is more characterful, deeper and wider. The Eisenmann wins on the high pitch level of the soundtrack, sound volume and the crackles at the top end, which the Handycam camera (without external mic) never recorded unfortunately. It is almost impossible to pick those up.

On the inside, the Akrapovic has more tone across the range due to its lower and wider nature of the sound track. It fills the cabin more than the Eisenmann does. The Eisenmann is similar in its volume level, but less “cabin filling” due to its high pitch and less darker or bombastic sound track. This is just a difference in tone and resonance.

All in all, the clear difference between the two is tone and character. The Akrapovic system gives you more freedom between being relatively quiet and loud due to the type of valve control. The Eisenmann system is either loud or a touch louder than already loud, there is no under the radar mode so to speak. The Akrapovic exhaust has a more characterful sound track, deeper, less shouty, you could call it more sophisticated. The Eisenmann is way more in your face, shouty and out there for everyone to hear every single time you drive the car.

In some ways, you could compare the two sound wise (not looks wise ) as a baritone signer in a suite offering a controlled overture when you prefer (Akrapovic) versus Christina Aguilera in a funky dress trying to reach that high note every single time to rev it to the max (Eisenmann). That is how it felt after we tested both.

MR