Kits in this competition group are configured for use in unrestricted class road racing with 17 or larger wheels. FSL6RST six - piston calipers with Thermlock pistons are matched with 12.88 directional vane GT competition rotors. These proven winners have delivered championship performance in road racings most grueling production car categories. Dynamicaly mounted rotors to forged aluminum hats, with radial mount brackets secure the calipers to the OE location without modification. Kits also include BP - 30 high friction race compound pads, premium grade hardware, and stainless steel braided flexlines.