This is the new low-downforce body from Xray for their XB9 buggy. Designed specifically for rough, damaged tracks, this body reduces downforce and makes the car easier to drive on this sort of track. This new body is wider to fit the XB9’13 wider chassis so bear this in mind when using it with earlier XB9 models.
#359708 Xray XB9 Low-Downforce Body
Source: Xray