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With the 2013 BMW M5 finally going on sale in the U.S., we definitely saw this coming. BimmerBoost recently got a hold of engine dyno run for the new M5, and is reporting that the car's twin-turbo V8 is "severely" underrated.

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A German tuning outfit called PP-Performance has put the 2012 BMW M5 on a Maha dyno, and the numbers returned were 444 horsepower at the wheel, 553 at the engine, and a "corrected number" of 574 hp. Max torque came in at 532 pound-feet (721 Newton/meters).