Would be the twin-turbo Edition of the 13B engine created to power the 3rd-era RX-seven released in late 1991. Every rotor on 13B-REW has one combustion chamber quantity of 654cc. With two rotors, the whole displacement was 1308cc. Ideal healthy for your Mazda swap or substitution venture. The 13B-REW engine https://www.nwjdmmotors.com