would be the twin-turbo version on the 13B engine meant to power the 3rd-generation RX-7 released in late 1991. Every single rotor on 13B-REW has a single combustion chamber volume of 654cc. With two rotors, the whole displacement was 1308cc. Fantastic in shape to get a Mazda swap or replacement challenge.About VehicleHistory.com Automobile Heritag