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      07-05-2008, 12:39 AM   #157

Drives: E93 335i
Join Date: Aug 2007
Location: The place for Bimmers

Posts: 5,949
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it's noticeable on the 335i's because the valve is closed on startup and suppressed under 2500 RPM, but after that it opens up. I don't think the 330i's have that type of system since they only have one muffler....correct me if i'm wrong.