Could be the twin-turbo Model from the 13B engine designed to energy the 3rd-era RX-seven launched in late 1991. Every rotor on 13B-REW has only one combustion chamber volume of 654cc. With two rotors, the overall displacement was 1308cc. Ideal in shape to get a Mazda swap or replacement undertaking. https://trentonbzewh.kylieblog.com/31392665/new-step-by-step-map-for-13b-rotary-engine-for-sale