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Function of 545i Butterfly valve in exhaust?

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Old 06-23-2008, 04:00 AM
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Hello,

The right silencer endpipe of the 545i (2004 / Europe) has an active Butterfly valve.
It is placed in / just after de final resonator.

Does anybody know what is does?
Is it for noice reduction, or for smooter power?

Can it easily be put out of order?
What is the effect? Better sound?

Are the anny posible negative side effects?


Thanks
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Old 06-23-2008, 06:35 AM
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Welcome to the forums.

Take a look here for some more information...

http://forums.e60.net/index.php?showtopic=2861
http://forums.e60.net/index.php?showtopic=2982
http://forums.e60.net/index.php?showtopic=4811
http://forums.e60.net/index.php?showtopic=20426
http://forums.e60.net/index.php?showtopic=39291
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Old 06-23-2008, 08:12 AM
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Just acanned through those links.

Rudy, mine doesn't have a valve. Does yours?

I didn't have the car on a hoist so maybe I just can't see it. I did use a mirror.
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Old 06-23-2008, 12:22 PM
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the short of it ...
German Noise Drive by standards...
Car can only make so many decibels up to about 45mph, then the car can be much louder.
Porches, VW ( yep the R32 has the "Flapper Valve") and many BMW and Mecs...
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Old 06-23-2008, 01:17 PM
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Originally Posted by bigbadbull' post='608484' date='Jun 23 2008, 10:22 PM
the short of it ...
German Noise Drive by standards...
Car can only make so many decibels up to about 45mph, then the car can be much louder.
Porches, VW ( yep the R32 has the "Flapper Valve") and many BMW and Mecs...
correct.
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Old 06-23-2008, 01:23 PM
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Originally Posted by sixcard' post='608287' date='Jun 23 2008, 12:12 PM
Just acanned through those links.

Rudy, mine doesn't have a valve. Does yours?

I didn't have the car on a hoist so maybe I just can't see it. I did use a mirror.
My 545 had it -- I never bothered to look at my 550...
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Old 06-23-2008, 02:23 PM
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The US cars have it. I would think It's for noise suppression; the inner pipe opens during strong acceleration.
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Old 06-23-2008, 03:58 PM
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Originally Posted by pennetta' post='608598' date='Jun 23 2008, 06:23 PM
The US cars have it. I would think It's for noise suppression; the inner pipe opens during strong acceleration.
Hey Pennetta, did you look at your 535?


My 550 about same vintage as your 535 and does not have the butterfly.
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Old 06-23-2008, 04:06 PM
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Does this affect performance (Low end torque) or is this just for noise suppression at low RPM?
Thanks.
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Old 06-23-2008, 06:01 PM
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Originally Posted by Rizbel' post='608669' date='Jun 23 2008, 08:06 PM
Does this affect performance (Low end torque) or is this just for noise suppression at low RPM?
Thanks.
Just affects noise.
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