This is the Carbon RAM Air System by Coltspeed.
The air diversion panel for CX/CY4A is available to purchase as an option, and recommended by Coltspeed.
The panel is included with the LanEvoX kit
Make: Mitsubishi
Models: Galant Fortis, LanEvo X
Fits: CX4A/CY4A/CZ4A
Material: Carbon