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  #1  
Old 01-02-2010, 12:02 AM
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Exhaust sound changes due to M button?

I purchased a White / Cinnamon X5 M a few days ago, and I was surprised to learn that the exhaust note varies with the use of the M button. It is a really nice feature. Does anyone know exactly what allows this to happen?

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Dave
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Old 01-02-2010, 12:32 AM
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i have an e70 30i and i noticed the exhaust sounds different when i shift to Sport mode. i think the engine revs higher hence the change in sound.
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Old 01-02-2010, 12:35 AM
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Certainly, higher engine speeds= more sound, but I'm confident that there is a distinct difference from the moment that the M button is pressed. And the owner's manual mentions it, but does not elaborate.
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Old 01-02-2010, 12:39 AM
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There is a flap in the exhaust the opens up when the "M" button is pressed.
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Old 01-02-2010, 12:44 AM
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^^^what he said.
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Old 01-02-2010, 02:12 AM
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Quote:
Originally Posted by MINIz guy View Post
There is a flap in the exhaust the opens up when the "M" button is pressed.
Exactly. See pic below.
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Old 01-02-2010, 02:15 AM
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Originally Posted by cavemantrader View Post
I purchased a White / Cinnamon X5 M a few days ago,
Lets see pics of your White /Cinnamon combo.
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Old 01-02-2010, 04:01 AM
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Actually the sound change is not caused by the M button but by the settings of the M button (Sport).

Btw: could somebody check out if removing THIS hose actually causes the flap inside the exhaust tip to stay open permanently, hence providing the sportier sound all the time ?
If it works and you leave it removed, just make sure you put something inside that hose to avoid dirt/humidity entering.
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Old 01-02-2010, 11:35 AM
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Originally Posted by RTC View Post
Btw: could somebody check out if removing THIS hose actually causes the flap inside the exhaust tip to stay open permanently, hence providing the sportier sound all the time ?
If it works and you leave it removed, just make sure you put something inside that hose to avoid dirt/humidity entering.
I have read that its doable. Lets see who is the first here to try out.
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Old 01-03-2010, 03:00 PM
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Just a guess but... the flap may keep a little back pressure to help with lowerend torque. My guess would be that even without the M button pressed when the engine reaches hight RPM that it opens to allow the engine to breath and produce more hp.
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