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Originally Posted by ben1364
...I don't think much of the idea of diddling with airflow based on heresay.
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What else do you have to go by?
There's a lot of good hearsay here.
It's got to increase air flow and I believe the article said the filter is not on European models.
I don't know if the charcoal filter is on the E90?
I have 2 questions:
1. Would this void the warranty?
2. Do you think your BMW dealer would do this for you?