The Z4 is offered as three different models; sDrive28i, sDrive35i, or sDrive35is. Power for the sDrive28i comes from a 240-hp 2.0-liter direct-injection, turbocharged four-cylinder engine. The sDrive35i is powered by a twin-turbo, 300-hp 3.0-liter inline six-cylinder engine, while the sDrive35is gets a 335-hp version of the twin-turbo 3.0-liter inline six. Transmission choices include a six-speed manual, eight-speed automatic, or an advanced double-clutch seven-speed transmission. Standard features include Driving Dynamics Control which allows the driver to change the vehicles characteristics between normal, sport, and sport+ mode, adaptive brake lights, and a two-piece lightweight-aluminum hardtop. For 2012, the sDrive30i has been replaced by the sDrive28i sporting BMW's new TwinPower four-cylinder turbo engine.