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Discussion Starter · #1 ·
2001 330xi.

I was polishing the tailpipes, and noticed a butterfly in one of them attached to a vacuum selenoid. Is this stock, or did the previous owner outfit the car with this equivalant to the "Silent Choice" in powerboats? It sure looks factory to me. Anyone know?
 

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Discussion Starter · #6 ·
Well, I see that you guys have already answered my my next question - disconnect and plug the vacuum line. I'll give it a try. Do all E46 have this tailpipe valve?
 
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