May be the twin-turbo Edition on the 13B engine meant to electric power the third-era RX-seven released in late 1991. Each rotor on 13B-REW has a single combustion chamber volume of 654cc. With two rotors, the whole displacement was 1308cc. Excellent in good shape for any Mazda swap or replacement https://custom-rx739370.eedblog.com/29852916/not-known-facts-about-13b-engine-for-sale