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VF Engineering Performance ECU Software for 2009-2011 Porsche 911 (C2/C4) ES200 One-way adjustable damping and full-lengthVF Engineering's Performance ECU Software unlocks a significant step up in power, torque, and throttle response for the Porsche 911 (C2 C4). Developed in house by VF Engineering's calibration team, this precision engine tune sharpens acceleration and drivability across the rev range while keeping the factory smoothness and reliability that make the 911 so usable every day. Each calibration is tailored to the Porsche 911 (C2 C4)'s engine and integrates