Graphite brace installed in front part of side guards makes the front chassis flex stiffer. Using this option part the car is easier to drive and cornering speed is increased. The brace also makes landing after jumps more forgiving. This brace is used by the entire XRAY Racing Team on the XT2 to make it super easy to drive, especially with spec tires that generally make the cars more aggressive. Suitable for XB2C, XB2D, and XT2