Could be the twin-turbo Edition from the 13B engine meant to electric power the third-technology RX-7 introduced in late 1991. Each and every rotor on 13B-REW has only one combustion chamber quantity of 654cc. With two rotors, the whole displacement was 1308cc. Ideal healthy for any Mazda swap or substitution https://eduardonyrsy.suomiblog.com/considerations-to-know-about-custom-rx7-54567137