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Question on the X3 tailpipe.. Question on the X3 tailpipe..
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Old 09-20-2006, 08:02 PM
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Question on the X3 tailpipe..
As I was installing my new hitch, I noticed that the left tailpipe has a 'Butterfly' (valve) that opens and closes. It was closed while idling, I drove it for about an hour and noticed it was still closed? What's it for and when does it open?

I checked my Z4 and it doesn't have that valve.
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