may be the twin-turbo version of your 13B engine made to ability the 3rd-generation RX-seven introduced in late 1991. Every rotor on 13B-REW has one combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Ideal match to get a Mazda swap or substitution undertaking. Superior 1st take a look at into the web site. Had