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2016 Subaru WRX STI Series HyperBlue Limited Edition Review & Test Drive. The 2016 Subaru WRX STI Hyperblue is a limited edition with a 2.5L boxer engine producing 305 horsepower and 290 lb-ft of torque. This is sent through a 6-speed manual transmission to a driver controlled center differential, DCCD. The STI features three limited slip differentials, with a front helical LSD and a rear Torsen L