[E90aL]

Originally Posted by intensee92

Question, so once you take out the charcoal filter right, did you all just replace the charcoal filter with a K&N filter and leave the other air filter in...? (two filters)

Or remove the charcoal filter and replace the air filter with a K&N one. (one filter)

Originally Posted by anthoj

I too am wondering about this. My K&N arrives tomorrow. I am impatiently waiting to install it. What is the advantage/disadvantage of the charcoal filter?

Thanks

you remove the charcoal and replace the air filter with the k&n. The advantage, better airflow(not as much restriction, 1 filter vs. 2). The disadvantage, something about the gasses escaping from the intake when you turn the car off(unsure about this)