Italian tuner Romeo Ferraris has announced its tuning program for the F10 M5.
Featuring a ECU software tune and sports exhaust system, it pushes the M5 to 657 PS (648 hp) and 790 Nm (583 lb-ft) torque. That's +97 PS (96 hp) and 110 Nm (81 lb-ft) increase over the factory M5 power figures.
The sports exhaust system alone (featured in the video below) is claimed to provide a +21 hp and +30 Nm of torque gain.