In addition to the standard LFS vehicles, the CTRA X-System runs three custom car classes using voluntary restrictions: the Formula Junior (FJR); the GT2 class, and; the UF-BabyR (UF-BR). In order to compete in these classes, drivers are required to add air restrictions and additional ballast to their vehicles. Shown here are the current restrictions/specifications for the FJR, GT2 and UF-BR classes.