May be the twin-turbo Model in the 13B engine meant to energy the 3rd-generation RX-seven introduced in late 1991. Every rotor on 13B-REW has just one combustion chamber quantity of 654cc. With two rotors, the full displacement was 1308cc. Great in shape to get a Mazda swap or replacement job. https://13b-twin-turbo-engine-for27158.blue-blogs.com/36468569/the-definitive-guide-to-mazda-13b-rew-motor-for-sale