Could be the twin-turbo Edition in the 13B engine intended to energy the 3rd-era RX-7 released in late 1991. Each individual rotor on 13B-REW has a single combustion chamber quantity of 654cc. With two rotors, the total displacement was 1308cc. Fantastic fit to get a Mazda swap or replacement challenge. https://trentongzsjc.gynoblog.com/37783952/not-known-facts-about-rx7-engine