May be the twin-turbo version with the 13B engine meant to power the 3rd-era RX-seven released in late 1991. Just about every rotor on 13B-REW has a single combustion chamber volume of 654cc. With two rotors, the total displacement was 1308cc. Excellent fit for the Mazda swap or substitute venture. https://13b-engine-for-sale15815.blogsvila.com/30699507/top-latest-five-13b-rew-engine-for-sale-urban-news