G-Power released more photos and details referring to their Stage 1 tuning program for the 2012 BMW M5 F10.
The program adds 80 HP (59 kW) and 97 Nm of torque to the standard 560 HP  and 680 Nm through revised engine electronics and an ASA supercharger which bring the M5’s 4.4-litre V8 to a total of 640 horses and 777 Nm of peak torque.
G-Power says that unlike many tuners who simply push the output figures, their program is a well-balanced, high-quality package which also focuses on reducing stress on the transmission.
The G Power 2012 BMW M5 F10 is now able to spring from 0 to 100 Km/h in 3.9 seconds and will go over 315 Km/h.
Other upgrades performed by G-Power on the new M5 include the coilover suspension system, the ceramic braking system, the stainless steel muffler and the 21 inch forged wheel set using 265/30 ZR 21 and 305/25 ZR 21 Michelin tires.

Source: G-Power