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Originally Posted by shadye90
As posted in the other thread regarding my K&N filter replacement, I discovered that the E90 airbox actually houses 2 filters..one that you normally take out to replace and one built into the housing..looks like the second one is to filter out additional crap to preserve the Mass airflow meter..so i'm gonna say that by installing a TRUE cold air intake(like the ones that M MOTOTWERKS.com sells for the e46 etc..) along with a filter heatshield box it should make some decent HP increases since they will eliminate the second filter...
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The second part you are seeing in the stock airbox actually is not a filter but an aerodynamic device. Itīs there to streamline the air going to the MAF and thereby increase the accuracy of the MAF. Getting rid of it will DECREASE the accuracy of the MAF and therefore net you a loss in efficiency of the engine.
Better not to mess with things you donīt understand. Anybody care to mod the intake on an airplane engine ?