Could be the twin-turbo Model on the 13B engine built to ability the 3rd-generation RX-seven released in late 1991. Each rotor on 13B-REW has a single combustion chamber quantity of 654cc. With two rotors, the whole displacement was 1308cc. Excellent suit to get a Mazda swap or replacement project. Recommendations https://eduardovofvg.thenerdsblog.com/35392659/not-known-details-about-built-13b-motor-for-sale