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 have 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 version. The ride is not punishing, though it is choppy. Fit and finish is very good, and the power-operated top is well-insulated and has an automatic latching system. Standard electronic stability control and traction control keep the Z4 secure.