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      02-10-2006, 03:34 AM   #79
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Drives: 2006 325i SG Sedan
Join Date: Oct 2005
Location: Bay Area, CA

Posts: 27,450
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Originally Posted by ben1364
Can anyone tell me why BMW would spend the money on the charcoal filter in the intake if it serves no useful purpose?
it's there because CARB (california air resources board) requires it to be there. it's purpose is to absorb hydrocarbons while the motor is off. as stated here and on the other thread, the charcoal filter is not found on newer bmw's outside the US.
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