The Brembo GT rear big brake kit for 1997–2004 Porsche 986 Boxster outfits the rear with four-piston cast calipers and 345 x 28 mm two-piece slotted rotors in a silver Type‑1 finish. Marketed as a Rear GT BBK, this package contains the 4‑piston calipers and 2pc 345x28 slotted rotors specified for the 986 Boxster rear applications noted in the source.
Brembo 97-04 986 Boxster Rear GT BBK 4 Piston Cast 345x28 2pc Rotor Slotted Type-1-Silver