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 horsepower flex-fuel platform, while still retaining excellent street manners, cold start behavior, and day-to-day usability.