Could be the twin-turbo Edition from the 13B engine meant to electric power the third-technology RX-7 released in late 1991. Every single rotor on 13B-REW has just one combustion chamber volume of 654cc. With two rotors, the entire displacement was 1308cc. Fantastic in shape to get a Mazda swap or https://kameronewlbr.canariblogs.com/jdm-mazda-engine-an-overview-53676860