The torque output remains the same at 650 nm, however, it is produced across a wider rpm range - from 2,750 to 5,730 rpm. As a result, performance is slightly improved. The M4 Competition Coupé accelerates from 0-62 mph in 3.5 seconds, while the M4 Competition Convertible takes 3.7 seconds to reach the benchmark. As always, top speed is electronically limited to 155 mph, although this can be increased to 174 mph (Coupé) or 180 mph (Convertible) when the optional M Driver’s Package is selected.