4-Piston Caliper Kit with 2-Piece Vented Slotted Rotors

This comprehensive upgrade kit ensures superior stopping power and reliability when you need it most. The calipers are constructed from a single billet of aircraft-grade aluminum, offering a lightweight yet incredibly strong and corrosion-free foundation. Inside, aluminum pistons provide improved heat resistance and long-term performance. The 2-piece rotors feature a vented and slotted design with an aluminum center hat, which reduces rotational mass, sharpens braking response, and shortens stopping distances. This design also minimizes the risk of rotor warping by allowing for more unrestricted expansion and contraction. Reinforced carbon steel caliper brackets ensure these larger-than-OEM calipers mount directly to the existing points. The kit includes heavy-duty caliper seals for sustained high-temperature use and stainless steel brake lines that resist expansion under pressure, leading to a firmer and more responsive pedal feel. Key specifications include 4-piston calipers, 330mm (13-inch) outside diameter rotors, and a minimum required wheel diameter of 432mm (17 inches). It is compatible with the 1993-1998 Subaru Impreza STI models.