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      09-29-2010, 07:37 PM   #144
ska///235i
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Drives: 325xi>M235i>428GCx Mspor
Join Date: Sep 2005
Location: Boston

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2006 325xi  [0.00]
No, regular air filter....then charcoal filter

Quote:
Originally Posted by 777ER View Post
There's a charcoal filter that's permanently attached to the lower airbox, and then there's a replaceable filter after that.

Works like this: Air goes into the airbox, then passes thru the charcoal filter, then into the replaceable filter, then into the engine.

The charcoal filter is there to capture backflow from the engine when it's shut down, ie fuel vapors or mist from the PCV system.

I don't know why it's worth putting it in there, even my wife's 2010 Accord V6 doesn't even have it.
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2006 325xi (Sold)
2014 M235I (Current)
2015 428xi Gran Coupe (STB)
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