Would be the twin-turbo version in the 13B engine meant to electricity the third-generation RX-7 released in late 1991. Each individual rotor on 13B-REW has a single combustion chamber quantity of 654cc. With two rotors, the full displacement was 1308cc. Best suit for just a Mazda swap or alternative job. https://ricardoafonm.blogdeazar.com/31010607/5-tips-about-13b-renesis-engine-for-sale-you-can-use-today