May be the twin-turbo Model on the 13B engine created to energy the third-era RX-7 released in late 1991. Just about every rotor on 13B-REW has an individual combustion chamber quantity of 654cc. With two rotors, the overall displacement was 1308cc. Excellent fit for a Mazda swap or substitute undertaking. https://elliotctkzq.blognody.com/45320980/mazda-rx-7-engine-no-further-a-mystery