is the twin-turbo Edition of the 13B engine intended to energy the 3rd-generation RX-7 released in late 1991. Each rotor on 13B-REW has a single combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Excellent in good shape for any Mazda swap or alternative project.They need to be disassembled quite meticulously, tho