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      05-23-2017, 06:18 AM   #1
FANBMWM
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M2 Akrapovic Hidden exhaust mode

I have recently seen a lot of threads showing the hidden exhaust mode on the stock exhaust and MPE. My question is dose this mode work on Akrapovic exhaust ? Dose it sound and crackles the same as MPE?
Thank you in advance
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      05-23-2017, 08:00 AM   #2
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Yes, the Akrapovic retains the stock valve movement if you don't upgrade to their sound kit.
You get one additional OEM exhaust valve to mount on the other side when you buy the exhaust and just piggy pack the stock electronics to mimic it.
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      05-23-2017, 09:34 AM   #3
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Quote:
Originally Posted by metrickid View Post
Yes, the Akrapovic retains the stock valve movement if you don't upgrade to their sound kit.
You get one additional OEM exhaust valve to mount on the other side when you buy the exhaust and just piggy pack the stock electronics to mimic it.
Ok this is a good place to throw in this question which has been nagging at me. I have the MPE which is obviously a valve exhaust. Does the MPE eliminate the stock exhaust valves or are the MPE valves in addition to the stock? If so where are the stock valves located? Are the stock valves still controlled by the driving mode button i.e. Comfort, Sport, Sport + ? I know the MPE valves are controlled separately by its own controller.
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      05-23-2017, 09:49 AM   #4
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Quote:
Originally Posted by m34m View Post
Ok this is a good place to throw in this question which has been nagging at me. I have the MPE which is obviously a valve exhaust. Does the MPE eliminate the stock exhaust valves or are the MPE valves in addition to the stock? If so where are the stock valves located? Are the stock valves still controlled by the driving mode button i.e. Comfort, Sport, Sport + ? I know the MPE valves are controlled separately by its own controller.
The valve on the stock exhaust are moved over to the Akrapovic. I don't know if BMW supplies an extra valve to the MPE or if it comes with two new but either way it replaces the stock valve as it is installed on the muffler which is removed.
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      05-23-2017, 08:26 PM   #5
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Quote:
Originally Posted by m34m View Post
Ok this is a good place to throw in this question which has been nagging at me. I have the MPE which is obviously a valve exhaust. Does the MPE eliminate the stock exhaust valves or are the MPE valves in addition to the stock? If so where are the stock valves located? Are the stock valves still controlled by the driving mode button i.e. Comfort, Sport, Sport + ? I know the MPE valves are controlled separately by its own controller.
The MPE has it's own valves. The valves are located near the muffler.
With the MPE, the driving mode button no longer controls the valves.

The hidden exhaust mode, is actually nothing to do with the valves and instead an ecu setting to make glorious sounds.
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      05-23-2017, 11:00 PM   #6
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Quote:
Originally Posted by Smiley1175 View Post
Quote:
Originally Posted by m34m View Post
Ok this is a good place to throw in this question which has been nagging at me. I have the MPE which is obviously a valve exhaust. Does the MPE eliminate the stock exhaust valves or are the MPE valves in addition to the stock? If so where are the stock valves located? Are the stock valves still controlled by the driving mode button i.e. Comfort, Sport, Sport + ? I know the MPE valves are controlled separately by its own controller.
The MPE has it's own valves. The valves are located near the muffler.
With the MPE, the driving mode button no longer controls the valves.

The hidden exhaust mode, is actually nothing to do with the valves and instead an ecu setting to make glorious sounds.
So what you're saying is if you have MPE the driving mode button has no effect on the exhaust but instead alters sound via the ECU depending on the mode?

So to me this is interesting. On a stock exhaust for example if you select Sport or
Sport + the valves open in addition to ECU changes making the car louder. In a car with MPE no valves open in this scenario unless you choose to open the valves yourself with the MPE controller. So does this mean if you choose not to open those valves and go to track mode a car with stock exhaust and open valves in the the Sport modes will sound louder than the MPE car? :
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      05-24-2017, 02:53 AM   #7
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Quote:
Originally Posted by m34m View Post
So what you're saying is if you have MPE the driving mode button has no effect on the exhaust but instead alters sound via the ECU depending on the mode?
Correct

Quote:
Originally Posted by m34m View Post
...

So to me this is interesting. On a stock exhaust for example if you select Sport or
Sport + the valves open in addition to ECU changes making the car louder. In a car with MPE no valves open in this scenario unless you choose to open the valves yourself with the MPE controller.
Correct

Quote:
Originally Posted by m34m View Post
...

So does this mean if you choose not to open those valves and go to track mode a car with stock exhaust and open valves in the the Sport modes will sound louder than the MPE car? :
Who's on first?? I had to read this bit a few times to understand the question, I may still not.
To make it simple, an MPE will always sound louder than a standard car. An MPE in it's quiet mode is still louder than a standard car with valves open.
Then the MPE in 'track' mode (i.e. exhaust valves open) is the loudest.

Having the car in 'traction' mode (hidden exhaust mode), i.e. pressing the traction button once, gives you the snap, crackle & pop burbles regardless of the exhaust. The MPE car will sound louder in that mode than the standard car. It's the way I drive the car most of the times, changing gears manually (DCT).

Hope that makes sense.
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      05-24-2017, 08:44 AM   #8
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does this mean that this hidden mode applies for the MPE and the 3rd party exhausts as well?
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      05-24-2017, 12:03 PM   #9
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Quote:
Originally Posted by Smiley1175 View Post
Quote:
Originally Posted by m34m View Post
So what you're saying is if you have MPE the driving mode button has no effect on the exhaust but instead alters sound via the ECU depending on the mode?
Correct

Quote:
Originally Posted by m34m View Post
...

So to me this is interesting. On a stock exhaust for example if you select Sport or
Sport + the valves open in addition to ECU changes making the car louder. In a car with MPE no valves open in this scenario unless you choose to open the valves yourself with the MPE controller.
Correct

Quote:
Originally Posted by m34m View Post
...

So does this mean if you choose not to open those valves and go to track mode a car with stock exhaust and open valves in the the Sport modes will sound louder than the MPE car? :
Who's on first?? I had to read this bit a few times to understand the question, I may still not.
To make it simple, an MPE will always sound louder than a standard car. An MPE in it's quiet mode is still louder than a standard car with valves open.
Then the MPE in 'track' mode (i.e. exhaust valves open) is the loudest.

Having the car in 'traction' mode (hidden exhaust mode), i.e. pressing the traction button once, gives you the snap, crackle & pop burbles regardless of the exhaust. The MPE car will sound louder in that mode than the standard car. It's the way I drive the car most of the times, changing gears manually (DCT).

Hope that makes sense.
Hahaha sorry for the confusion I tried to word it as precisely as I could. That's the best answer to this I've heard in fact the only answer that addresses it exactly. That's what I wanted to know if MPE is louder than stock even when stock valves are open and MPE valves are closed. Thanks.
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      05-24-2017, 03:08 PM   #10
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Quote:
Originally Posted by bimmercar View Post
does this mean that this hidden mode applies for the MPE and the 3rd party exhausts as well?
Yes to MPE and most likely yes to any other Exhaust. The hidden mode is more a programmed overrun to create those burbles in the exhaust. How those gases are then expelled out and the tone/volume/intensity it produces, is then a function of the exhaust design. But you'd still hear them.
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      05-24-2017, 06:35 PM   #11
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Quote:
Originally Posted by Smiley1175 View Post
Quote:
Originally Posted by bimmercar View Post
does this mean that this hidden mode applies for the MPE and the 3rd party exhausts as well?
Yes to MPE and most likely yes to any other Exhaust. The hidden mode is more a programmed overrun to create those burbles in the exhaust. How those gases are then expelled out and the tone/volume/intensity it produces, is then a function of the exhaust design. But you'd still hear them.
Dose Akrapovic with stock downpipes cracle the same like MPE/Stock ?
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