Will be the twin-turbo Model from the 13B engine designed to power the 3rd-era RX-7 introduced in late 1991. Each rotor on 13B-REW has only one combustion chamber quantity of 654cc. With two rotors, the total displacement was 1308cc. Excellent in shape for just a Mazda swap or substitute task. https://damienuwwxw.blogdomago.com/29072179/rx7-engine-an-overview