Nice find! Looks like it's #6 in the pics diagrams if you search for that part # on google images.
Looks like it sits just behind the grill, and blocks about 60% of the airflow through the front air dam. Allows air on the far left side to enter and cool the radiator. Also, appears it just blocks air from the backside, so this would not provide any aero benefit. Just for getting to open-loop/Lean Burn more quickly and to increase warm up times.
Neat OEM option for Eco-minded "purists" though
Thanks for posting!