with variable valve

All three engines in the Z4 come with variable valve control and develop plenty of torque at low revs; but the turbocharged engine in the sDrive35i is surprisingly strong. Adaptive M Suspension, available on all three Z4s, enables the best of all worlds, with improved ride quality plus tight body control when needed. All Z4 models come with Driving Dynamics Control, which lets you choose between Normal, Sport, or Sport+ modes--each dialing in different settings for the stability control system, throttle response, transmission behavior and even steering. In Z4s equipped with the Adaptive M suspension, it controls firmness, too