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The new 2012 BMW M5 produces an impressive 560 horsepower and 502 pound-feet of torque, but for companies like AC Schnitzer, the 4.4-liter twin-turbo V8 presents only a starting point. The German tuning company unveiled the new ACS5 Sport here at the Geneva Motor Show this week, managing to squeeze and additional 60 hp and 81 lb-ft from the forced-induction motor.