Could be the twin-turbo Model in the 13B engine meant to electrical power the 3rd-generation RX-7 released in late 1991. Every single rotor on 13B-REW has only one combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Excellent healthy for a Mazda swap or alternative task. https://rx7turbo2motorforsale26037.csublogs.com/46439863/the-mazda-rotary-engine-sale-diaries