May be the twin-turbo version of the 13B engine made to energy the 3rd-generation RX-7 introduced in late 1991. Each and every rotor on 13B-REW has an individual combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Ideal fit to get a Mazda swap or alternative https://rotary-13b46789.madmouseblog.com/19580823/what-does-13b-turbo-for-sale-mean