The Brembo GT big brake kit for 2006 BMW 330i (excluding xDrive) rear applications features a cast 4-piston caliper with two-piece 345 x 28 mm drilled rotors in red. Identified for that specific model and year, the rear kit pairs four-piston calipers with two-piece drilled rotors and is listed in the catalog as the replacement assembly for those applications.
Brembo 06 330i Excl xDrive Rear GT BBK 4 Piston Cast 2pc 345x28 2pc Rotor Drilled-Red