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STR8-6IX is right about high pressure in front of the car and hood and BMW stock air box being the best option. If you can get a proper scoop to ram air into the stock air box with a high flow drop-in, that is the best bet. Tune or not.
A bigger plenum on the air box might actually help and I think that's why aFe intake claims 30bhp bump in power which btw is 4.5 whp. Not an unreasonable claim nor is that noticeable or worth 500 bucks. So all in all stock air box wins with a K&N drop-in filter
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