Thread: Re: Vacuum operated Muffler
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Old Sep 15, 2007 | 08:01 PM
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andrew
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Default Re: Vacuum operated Muffler
my '06 bmw 330i has the similar butterfly valve in the muffler ... it opens on one side under full throttle (wot).

IMG_6047.jpg

IMG_6051.jpg

but i haven't seen anything in the aftermarket world.
 
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