May be the twin-turbo version of your 13B engine built to electricity the third-era RX-7 introduced in late 1991. Each and every rotor on 13B-REW has an individual combustion chamber volume of 654cc. With two rotors, the overall displacement was 1308cc. Excellent fit for your Mazda swap or substitute challenge. https://devinumevk.look4blog.com/76699118/the-2-minute-rule-for-13b-turbo-2-engine-for-sale