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Message: <blockquote data-quote="saat" data-source="post: 345401" data-attributes="member: 77">It is a small inverse aerofoil shaped flap placed in front of the wiper blade. Aerodynamic pressure on the aerofoil will be transferred as downwards pressure pressing the blade harder against the screen especially at high forward speeds. This ensure better contact between the blade and the screen and thus better wipe and prevents lift-off. They vary in size. In the case of the E46, it is about 12x3". In some cases, the spolier is attached to the arm whilst in most cars, they are attached to wiper blade frame. In both cases, it swings with the blade. Those where the spoiler is attached to the frame, the set comes with the blade, frame and spoiler e.g. E46. In most cars, only the driver side wiper has the spoiler. See the illustration - Spoilered Wiper Blade attached. In the frameless design, the spolier is integrated all along the wiper blade as a countoyred shape. The prevents the need for separate spoiler and also offers even contact pressure all along the wiper blade. In the case of the normal spiloer, most of the downward pressure is concentrated on the spolier region. See Illustration - Frameless Wiper blade attahced. Caveat - I am not a wiper blade salesman.</blockquote>