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The main grunt of the new RS5 comes from a 2.9-liter, twin-turbocharged V-6 mounted up front under the hood. On its own, that engine produces 503 horsepower, a figure that you might think is plenty. Here, though, it has some help here in the form of not one but two electric motors.。业内人士推荐体育直播作为进阶阅读