is the dual-turbo Model in the 13B engine built to energy the 3rd-era RX-7 launched in late 1991. Every single rotor on 13B-REW has a single combustion chamber volume of 654cc. With two rotors, the overall displacement was 1308cc. Ideal match to get a Mazda swap or substitution undertaking.Throttle response is a little bit sluggish when inventory a