May be the twin-turbo Edition on the 13B engine intended to electric power the third-technology RX-7 launched in late 1991. Each rotor on 13B-REW has only one combustion chamber volume of 654cc. With two rotors, the whole displacement was 1308cc. Great in good shape for your Mazda swap or substitution https://13brewforsale04061.blogdal.com/30181863/a-simple-key-for-jdm-mazda-engine-unveiled