May be the twin-turbo Variation on the 13B engine built to power the 3rd-era RX-7 released in late 1991. Each and every rotor on 13B-REW has only one combustion chamber quantity of 654cc. With two rotors, the whole displacement was 1308cc. Perfect suit for the Mazda swap or replacement task. https://dallasrgvhu.thezenweb.com/an-unbiased-view-of-13b-turbo-2-engine-for-sale-67590721