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The Vehicle This 2019 Subaru STI has been a long-term development project at Techni-Cal Tuning, starting as a completely stock vehicle and evolving through multiple stages of performance upgrades and calibration refinement. From the beginning, the goal was not simply to increase power, but to build a vehicle that maintained factory-like drivability while progressively increasing capability, safety, and long-term reliability. Over time, the STI evolved into a 640 wheel horsepo