05-23-2017, 06:18 AM | #1 |
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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?
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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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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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05-23-2017, 08:26 PM | #5 | |
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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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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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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, 12:03 PM | #9 | ||||
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05-24-2017, 03:08 PM | #10 |
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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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