May be the twin-turbo Model on the 13B engine intended to electrical power the third-generation RX-seven introduced in late 1991. Just about every rotor on 13B-REW has one combustion chamber volume of 654cc. With two rotors, the entire displacement was 1308cc. Ideal match for the Mazda swap or substitution job. https://chancetsrki.blogolenta.com/27772169/the-single-best-strategy-to-use-for-13b-engine-for-sale