Under the hood, Japan-spec Subaru WRX STIs come powered by a 2.0-liter DOHC 16-valve AVCS twin-scroll turbo Boxer power plant. It comes with 304 hp and 311 lb. ft of torque. It comes in the standard WRX STI and the upper WRX STI Type S trim. Subaru Tecnica International (STI) has been testing the WRX STI in Japan with the 2.0-liter direct injection turbo "DIT" boxer engine with upgraded blueprinted internals, a set of carefully weighed and balanced pistons, and a larger capacity ball-bearing turbocharger. But there's now word on when it will be dropped into the WRX STI. Also new for 2018 STIs, the performance-tuned sedans get 8-way power Recaro performance front drivers seat with red stitching, red accents and STI logo. They are Subaru's first power-adjustable Recaro seats offered in the WRX STI. They are an option on the Japan 2018 Type S models. U.S. models also get the performance seats (standard on STI Limited, optional for base trim).