You don't need the RS3 dust shields (for 370 mm rotors), but it's a nice basis for some DIY work
to protect the ball joints from heat.
The air flow under the front is some kind of a 'V'-shape from the center to the wheels on almost
all street cars. On the sides of a car there are low pressure areas. That's why the airflow inside
the wheels is allways from inside to outside.
This element focusses this air flow directly to the brakes.