The wing shaped under panel was a new design and it achieves both good down force and low air drag at the same time. The design secures the enough height from the ground and you can go over the curbs on a race track with confidence.
The inlet to the radiator is wide enough to be very effective to keep the water temperature in check and to avoid losing power.
There are the ducts for the stock fog light (of the early model). When fog lights are not installed, you could utilize them as the simple air duct for several purposes.