Is the twin-turbo version on the 13B engine meant to energy the 3rd-technology RX-7 released in late 1991. Each individual rotor on 13B-REW has just one combustion chamber volume of 654cc. With two rotors, the total displacement was 1308cc. Great in shape for just a Mazda swap or substitute undertaking. https://jdm-mazda-rx-7-fd-13b-rew02109.free-blogz.com/81064435/jdm-mazda-rx-7-fd-13b-rew-engine-for-sale-fundamentals-explained