A production M5 has an electronically limited top speed of 250 km/h (155 mph), but thanks to a recalibrated ECU, high-flow air filters and catalytic converters as well as a newly developed high-performance exhaust system, this car s power output was increased from 500 to 555 horsepower. Its maximum torque output now stands at 560 Nm (413 lb-ft), up from 521 Nm (384 lb-ft). By removing the governor, a top speed of 305 km/h (190 mph) could be realized.