Is definitely the twin-turbo version from the 13B engine made to energy the 3rd-era RX-7 introduced in late 1991. Every single rotor on 13B-REW has an individual combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Great in shape to get a Mazda swap or substitution https://mazda13brewmotorforsale82332.blogitright.com/30991694/the-basic-principles-of-rx7-13b-motor-for-sale