May be the twin-turbo version with the 13B engine created to energy the 3rd-generation RX-seven launched in late 1991. Each individual rotor on 13B-REW has an individual combustion chamber volume of 654cc. With two rotors, the full displacement was 1308cc. Best match for your Mazda swap or substitute challenge. Tagore https://elliotsjbsj.timeblog.net/74641115/13b-turbo-engine-for-sale-an-overview