Would be the twin-turbo version on the 13B engine built to ability the third-generation RX-seven introduced in late 1991. Just about every rotor on 13B-REW has a single combustion chamber volume of 654cc. With two rotors, the entire displacement was 1308cc. Fantastic fit for your Mazda swap or substitution job. https://13b-rew-motor-for-sale61481.webbuzzfeed.com/30301840/about-mazda-13b-motor-for-sale