The BMW 4-Series convertible (formerly 3-Series) is a compelling choice for drivers looking for open-air motoring with the security of a retractable hardtop. Competition includes the convertible models of the Audi A5, Mercedes-Benz E-Class, and Infiniti Q60. Available with turbocharged 4-cylinder (428i) and 6-cylinder (435i) engines, the convertible retains most of the performance and handling of the coupe. Torsional and bending rigidity is surprisingly good for a convertible, but this convertible weighs in at 2 tons. A comprehensive set of active safety enhancements ensure the best possible accidence avoidance capabilities.

The long-running 3-Series convertible becomes the 4-Series with the 2014 model year. The new model is about 2 inches longer, and 2 inches wider. The track and wheelbase have both increased. Styling changes are subtle: the most visible difference is in the front. Two engines are offered at launch: a 2.0l four-cylinder turbo rated at 240-bhp and a 3.0l turbocharged inline six rated at 300-bhp.