The Z4 comes in three different models: 3.0i roadster, 3.0si roadster, and 3.0si coupe. The coupe is a hard top version of the Z4. Inside the Z4 seats 2, its dash panels are wood or brushed aluminum, and leatherette upholstery is standard. The 3.0i model is powered by a 215 hp 3.0-liter engine and the 3.0si is powered by a 255 hp 3.0-liter engine. Both engines are controlled by a six-speed manual or automatic transmission.For 2006, the BMW Z4 is redesigned mid-cycle.