With Mercedes-Benz so proud of its new E-Class, it was only a matter of time before arch tuners Mercedes-AMG pushed out a high-performance version of the luxe sedan. Witness, therefore, the 2017 Mercedes-AMG E 43 4MATIC, a 401 horsepower super-sedan capable of taking five from 0-62 mph in just 4.6 seconds. Surprisingly, there's no meaty V8 giving all that grunt. …