With the 2007 BMW 3 Series Coupe’s new model designations come more potent powerplants under the hood. Each version starts with an aluminum 3.0-liter, dual overhead cam, 24-valve inline six-cylinder engine with variable valve timing mated to a standard six-speed manual transmission. But that’s where the similarities end. In 328i and 328xi guise, normal aspiration results in output of 230 horsepower at 6,500 rpm and 200 lb.-ft. of torque at 2,750 rpm, whereas the 335i uses twin turbochargers and direct fuel injection to reach 300 horsepower at 5,800 rpm and 300 lb.-ft. of torque available between 1,400 and 5,000 rpm.