![]() ![]() Subaru Tecnica International is pushing the performance envelope with engines and chassis technology. STI will need to stay with the competition The WRX STI Nurburgring race version uses different cams and higher-rate valve springs and other enhancements to enhance the performance envelope. Japan’s current 2015 WRX STI 2.0-liter boxer uses a combination of direct injection, high compression (10.6:1), Subaru Dual Active Valve Control System (D-AVCS), a twin-scroll turbocharger and an intercooler to get improved performance. ![]() It’s a better engine than the production 2.5-liter the new 2016 WRX STI comes with in all other global models. STI won the Nurburgring 24-hour race with this engine and it’s proven to be a great engine. It’s a proven Nurburgring 24-hr powerplant The new Japan-only WRX STI S207 uses the same engine that’s tuned to get a maximum power output to 328 PS (323hp). The Japan-market STI is powered by a 2.0-liter turbo boxer engine that produces 304hp and 311 lb ft of torque. Subaru launched the WRX S4 with a new “smarter” engine in Japan first, and then introduced it later to other world markets in the WRX and WRX STI in Japan. The new-generation WRX STI’s current 2.5-liter powerplant needs to be upgraded.
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