Is definitely the twin-turbo Variation with the 13B engine made to energy the 3rd-era 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. Perfect in good shape for the Mazda swap or replacement challenge. https://stephendhari.elbloglibre.com/39080206/the-mazda-rotary-engine-sale-diaries