Is the twin-turbo Model with the 13B engine built to power the 3rd-generation RX-7 introduced in late 1991. Just about every rotor on 13B-REW has only one combustion chamber quantity of 654cc. With two rotors, the total displacement was 1308cc. Excellent fit to get a Mazda swap or substitute venture. https://beauzgkpr.topbloghub.com/45376878/built-13b-motor-for-sale-an-overview