May be the twin-turbo Model with the 13B engine meant to ability the 3rd-generation RX-7 released in late 1991. Every rotor on 13B-REW has a single combustion chamber quantity of 654cc. With two rotors, the entire displacement was 1308cc. Perfect healthy for a Mazda swap or replacement undertaking. About VehicleHistory.com https://13b-turbo-for-sale61470.diowebhost.com/84909789/rx7-engine-an-overview