StopTech Sport Slotted Brake Rotors are premium 1-piece replacement brake discs for factory brake systems. This part (126.47019SL) is a single Front Left rotor designed specifically for the 2004-2007 Subaru Impreza WRX STi. Features include: directional power slots for improved heat dissipation, evacuation of brake dust and gases, and a durable black e-coating for superior corrosion resistance on non-friction surfaces. The slotted design improves initial bite and provides consistent performance under heavy braking. Note: This is an individual front-left rotor. For a complete axle set, pair with part number 126.47019SR (Front Right).