Would be the twin-turbo Edition from the 13B engine designed to energy the third-era RX-seven launched in late 1991. Just about every rotor on 13B-REW has only one combustion chamber volume of 654cc. With two rotors, the total displacement was 1308cc. Great suit for the Mazda swap or replacement job. https://mazda-13b-rew-motor-for-s13456.canariblogs.com/fascination-about-rotary-13b-53684861