The BMW experts from G-Power offered an upgrade program for the 2012 BMW M6 Coupe. As always, the specialist focused on the tech side of the car. 
The power kit, known as the M6 Bi-Tronik III, lifts output to 640 HP (471 kW) and 777 Nm (573 lb-ft), representing an increase of 80 HP (59 kW) and 97 Nm (71 lb-ft). All this was possible by optimizing the V8 twin-turbo  4.4-liter engine which receives a titanium exhaust system with 4-trim titanium/carbon tail pipes, as well as the Bi-Tronic III ECU remap.
Now, the coupe can achieve a top speed of 310 km/h (192 mph), even more than the version fitted with the optional M Driver’s Package that can reach "only" 189 mph (305 km/h).

Source: G-Power