The Alcon rear race brake kit for BMW E46 M3 features four-piston calipers and 355 x 28mm rotors with an anodized finish, specified as a rear race application for the E46 M3 platform. The kit is intended to provide a direct-fit replacement braking assembly designed around those rotor dimensions and caliper configuration to suit motorsport or high-demand street use that requires larger, race-oriented rear hardware.
Alcon BMW E46 M3 4 Piston 355x28mm Rear Race Kit - Anodized