my w124 4matic has some sort of fixed fan in the intake duct from factory. its there to enhance low rpm flow to give slightly better response or torque but it will hurt the topend no doubt. Merc in its 2006 v6 has a simillar vane setup that retracts on hi high rpm to retain topend flow rates. thus it sure helps low air speed but hurts high air speeds.

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Jay,
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-1995 Blue W202 C36 AMG (M) SOLD ;(
-1995 Black W140 S500 (Lady)
-1992 Black W124 E300 (Dima) (Ex-Mosselman
Twin turbo Kit).
-1988 Black W124 300 E 4-Matic.(Nadeen)
-1983 Brown W126 500SEL.(Old Lady)(Sold)
-1981 Gold W123 280CE.(Dareen)(Sold)
http://www.youtube.com/user/jayrasheed