May be the twin-turbo Edition from the 13B engine intended to power the 3rd-technology RX-7 introduced in late 1991. Each individual rotor on 13B-REW has just one combustion chamber quantity of 654cc. With two rotors, the whole displacement was 1308cc. Best suit for your Mazda swap or substitution project. I https://collinfxoev.life3dblog.com/37504411/new-step-by-step-map-for-rotary-engine-rx7