is the twin-turbo Model in the 13B engine made to electric power the 3rd-generation RX-7 introduced in late 1991. Every rotor on 13B-REW has one combustion chamber quantity of 654cc. With two rotors, the total displacement was 1308cc. Best fit for any Mazda swap or alternative challenge.My very first time buying a utilised JDM Mazda RX-seven FD 13B