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QST ECU Software for the Audi S6/S7 TDI. Our Software has been expertly developed on the dyno and tested vigorously on the road to provide a fully developed tuning solution offering exceptional gains in HP and Torque throughout the powerband and drivability exceeding expectations whilst still maintaining complete reliability as you would expect.
Stock: 349HP, 700NM
QST Tuned: 400HP, 820NM