May be the twin-turbo version of your 13B engine designed to ability the 3rd-technology RX-seven released in late 1991. Each and every rotor on 13B-REW has just one combustion chamber volume of 654cc. With two rotors, the total displacement was 1308cc. Perfect fit for any Mazda swap or substitute project. https://griffinnolgf.blogtov.com/10248171/a-secret-weapon-for-custom-rx7