Quote:
Originally Posted by delta-9-ginseng
So placing a K&N air filter instead of the OEM BMW one would result in a possibility of inducing engine damage via sand and stones getting in? I thought the K&N air filters increase air flow ever so slightly...
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Any K&N tyoe filter uses gauze for the filtering element. You have to oil them so the oil wicks up any dust or debrie. IF the filter isn't oil'd then you run teh risk of less filtration. Why do you think these tyoes of filters flow more air? because they are more pourous - ie bogger holes in the filtering element.