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I know this is a little off topic, but you guys got me thinking. I've always thought those openings in the front must be restrictive. I decided to go out to the garage and measure the openings and compare the cross-section to the inner diameter of the air box exit pipes. The inner diameter of the air box outlets on the N54 was approximately 48mm giving a total cross-section of 1,809 sq/mm x two outlets The plastic OEM down scoops actually narrow in the bend. The cross-section is a right-angle trapezoid. At the narrowest part the right angle lengths were 34mm high on one side, 142mm long, and 14mm on the other side. I came up with a cross-section area of 3,408 sq/mm x two openings. Now I recognize air travels differently around a bend and in a square-ish pipe, but it would appear that BMW gave us nearly two time the cross-section in the front openings when compared to the pipes leaving the air box. I don't know what this means, but thought it may be interesting to someone.
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