If "BMW 4 Series" doesn't ring a bell, it's because that's the new name for the coupe version of the BMW 3 Series, long considered the benchmark for everything a sports sedan should be, no matter how many doors it has. This coupe is a little lower and wider than the sedan, and to most eyes it looks sleeker and sportier. We recently rented a new 2014 435i from BMW. Under the hood is a 300-hp, turbocharged 3.0-liter inline six-cylinder mated to a six-speed manual. That power plant is considerably punchier than the standard 240-hp turbo 2.0-liter that powers the 428i.