The 2011 BMW Z4 is a two-door, two-seat roadster belonging to the model's second generation. Available in three trims: sDrive30i, sDrive35i and the top-of-the-line sDrive35is, it combines luxury, performance, and style in one package. The sDrive30i comes equipped with a 3.0-liter inline six-cylinder engine producing 255 horsepower, while the sDrive35i has a twin-turbo version of the same engine, bringing the output up to 300 horsepower. The sDrive35is features an upgraded version of this engine dialed up to 335 horsepower. All engines pair to a standard six-speed manual transmission with an optional seven-speed dual-clutch automatic on the sDrive35i and sDrive35is trims. Notable features include a retractable hardtop roof, leather upholstery, automatic climate control, and a 10-speaker sound system with a CD player and an auxiliary audio jack. It also comes with safety features such as antilock disc brakes, stability control, and a full contingent of airbags.