Would be the twin-turbo Edition in the 13B engine created to electrical power the third-generation RX-7 introduced in late 1991. Every single rotor on 13B-REW has only one combustion chamber quantity of 654cc. With two rotors, the overall displacement was 1308cc. Great healthy for any Mazda swap or replacement venture. https://mazda-rx-7-engine79942.blogkoo.com/mazda-13b-rew-motor-for-sale-an-overview-49399365