May be the twin-turbo Model on the 13B engine designed to electrical power the 3rd-era RX-7 introduced in late 1991. Each and every rotor on 13B-REW has one combustion chamber volume of 654cc. With two rotors, the total displacement was 1308cc. Perfect healthy for just a Mazda swap or substitution https://rowantxwvs.bloguetechno.com/considerations-to-know-about-mazda-13b-motor-for-sale-66187887