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I put an K&N in my wifes 325Ci 6 years ago, have re oiled it twice and she has put about 70k miles on it. No problems, no worries, just clean environmentally friendly reuseable filter.
That said, anyone that is afraid of maintaining a filter or having a greater responsibility to their cars maintenance should just let a dealer or lube joint swap dry filters.
I have a K&N for my E90 LCI sitting in the box right now, and when I get done typing, I am going to drop it in the car.
What is the prospective gain of removing the charcoal filter other than airflow?
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