Could be the twin-turbo Edition of the 13B engine intended to power the third-technology RX-7 introduced in late 1991. Every rotor on 13B-REW has an individual combustion chamber quantity of 654cc. With two rotors, the whole displacement was 1308cc. Excellent in good shape for a Mazda swap or alternative undertaking. https://griffinjcrdr.wssblogs.com/29826831/new-step-by-step-map-for-rx7-13b-motor-for-sale