Romeo Ferraris is developing a new tuning program for the BMW M5.

Romeo Ferraris is developing a new tuning program for the BMW M5.

Autoblog.nl is reporting the model will be equipped with a revised ECU and a sports exhaust system. This will enable the twin-turbo 4.4-liter V8 engine to produce 657 PS (483 kW / 648 hp) and 790 Nm (583 lb-ft) of torque - an increase of 97 PS (71 kW / 96 hp) and 110 Nm (81 lb-ft).

Performance specifications weren't released, but the standard model accelerates from 0-100 km/h (62 mph) in 4.4 seconds and has a limited top speed of up to 305 km/h (190 mph).

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