As the blue arrow shows in the picture, Ferrari have increased the height of the barge board (it's a plece of bodywork that sits in front of but lower than the side air in-takes). It's primary purpose is to regulate the air-flow around the sides of the car. Typically the barge board rear-facing edge (or as we like to call it 'barge board profile' ) is smooth and slanting down. By giving it a sabertooth profile and varying the height of the profile it is supposed to reduce the turbulence in that area and provide for better engine cooling as the less turbulent air enters the engine side air in-takes - better engine cooling means better reliability.
Ferrari Barge Board Japan 2006
Image courtesy www.formula1.com