Vrrooom

Can someone explain to me the significance of this? I have the base Z06 and for the track it says to take off, but to leave on for the street. For all other ground effects options it says to leave on for the track as well.

What does this piece do? I assume it reduces front downforce when installed with the base painted spoiler and increases when removed. But a little more detailed explanation would be great.

Does anyone know the aero/downforce impact by upgrading to the carbon (non z07h ground effects? And the impact of the taller wickers in the rear for downforce?

CGZO6

When installed, probably reduces drag for street driving gas mileage. When removed, probably increases downforce (more drag) for track.