May be the twin-turbo version with the 13B engine intended to energy the 3rd-era RX-seven launched in late 1991. Each individual rotor on 13B-REW has just one combustion chamber volume of 654cc. With two rotors, the whole displacement was 1308cc. Ideal in good shape for the Mazda swap or replacement https://beaukeurf.gynoblog.com/37784024/the-greatest-guide-to-mazda-13b-rew-motor-for-sale