Will be the twin-turbo version of your 13B engine meant to electricity the 3rd-era RX-7 released in late 1991. Just about every rotor on 13B-REW has just one combustion chamber quantity of 654cc. With two rotors, the overall displacement was 1308cc. Excellent match for your Mazda swap or alternative job. https://rotaryengineforsale67518.blogsvirals.com/37752506/considerations-to-know-about-mazda-13b-motor-for-sale