May be the twin-turbo version in the 13B engine made to energy the 3rd-technology RX-7 released in late 1991. Every single rotor on 13B-REW has just one combustion chamber quantity of 654cc. With two rotors, the entire displacement was 1308cc. Perfect healthy for the Mazda swap or replacement job. Universal https://13bturbo2engineforsale16058.tinyblogging.com/the-mazda-rotary-engine-sale-diaries-82863023