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Originally Posted by E90Fleet
There seems to be a bit of confusion about this
1) Only USA cars have this
2) Its there to meet a USA emmision requirement to filter gasses escaping from the engine through the intake system when the car is parked
3) The part cannot be bought alone, you need to buy a complete new filter housing to get one, which should be a couple hundred dollars
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Thanks for pointing out that the filter element is not available as a stand alone part. I'm not surprised given the way it is installed.