ABS and ESC standard. Side air bags standard.
The Z4 is not as agile as the Porsche Boxster or Honda S2000, largely because of its imprecise electric steering. The inline six-cylinder engines are impressive. The M roadster and coupe return with a 330-hp, 3.2-liter engine and a conventional steering setup, which is much better. We tested the muscular 215-hp, 3.0-liter engine. The ride is not punishing, though it is choppy. Fit and finish is good, and the top is well-insulated. It is also power-operated and conveniently doesn't require manual latch release. Standard electronic stability control and traction control keep the Z4 secure.