The Z4 is a small rear-wheel-drive convertible with seating for two. Where its predecessor featured classic roadster styling, the Z4 strikes off in a more stylish direction that is sure to polarize. The styling is so bold that the side profile even features a large Z amongst the creases. Like 3-Series sedan, the Z4 features two versions of of the same 3.0L inline six tuned to 215hp (3.0i) and 255hp (3.0si). The ultimate Z4 is the factory-tuned M Roadster performance model. The M Roadster features the 330hp, 3.2L six-cylinder of M3 fame. A tuned suspension, 18 inch wheels and different front fascia further differentiate the M Roadster. The Z4 and M Roadster are manufactured in the U.S. in South Carolina.

The Z4 roadster adopts the N52 3.0L six from the new 3-Series. The Z4 3.0i produces 215hp, an increase of 31 hp over last years 2.5i. The 3.0si produces 255hp, a 30 hp increase. The M roadster returns with a 330hp, 3.2L six-cylinder under the hood. The M package also adds a recalibrated suspension, 18-inch wheels, and a new front fascia.