This is the XRAY XB2 Composite Front Lower Chassis Brace V2 (Hard).
The front lower chassis brace is another component of the Multi-Flex™ system that influences flex and the handling of the car. The brace is molded from HARD composite and is suitable for high- and very-high-traction conditions. More stable and less traction on front suspension.
The brace is mounted directly to the chassis to hold the entire front assembly and front suspension, including the front protection bumper.