StopTech rear wheel Big Brake Upgrade for the 2003 Subaru WRX. The kit includes ST-22 2-piston opposed billet rear calipers painted red, black, or silver, 7075-T6 billet aluminum caliper mounting brackets, 328x28mm slotted, floating, rear AeroRotors, 7075-T6 billet aluminum AeroHats with directional standoffs, StopTech SS (DOT compliant) rear brake lines, and Hawk HPS rear brake pads. Requires 17 inch or larger wheels, however not all 17 inch wheels will fit.