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m5 underrated

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    Report: 2013 BMW M5 may have more horsepower than reported

    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. Officially, the M5's 4.4-liter V8 is rated at 560 horsepower and 500 ...


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