2019 Mercedes-Benz C450 AMG Quick Spin There's a basic model, then an S, and if applicable, an RS at the top of the range. BMW has tried to replicate this formula with cars like the 135is and 335is, and more recently, the new M235i and X4 M40i. Mercedes' analog is the new (stillborn) AMG Sport line, and this C450 AMG 4Matic challenger to Audi's S4. It's got the right credentials - AMG's brand cache is backed up by a twin-turbo V6, a tweaked 4Matic all-wheel-drive system that sends two-thirds of its power to the rear axle, a sportier aesthetic, and sharper, more precise reflexes. But what a car like this needs is verve and drama. It has to make you want to drive it hard. With the C450, a week behind the wheel showed off stellar driving dynamics, but its character is too cool and businesslike - this is more C300 than C63. Unquestionably the star of the show, Mercedes' new 3.0-liter, twin-turbo V6 is a hoot. More than any other piece of this car, it feels like a tr...