Even though they are offering a power program for the current M5 F10 that takes performance up to 640 horses, G Power’s most impressive work is still based on the previous generation M5. 
This time the German tuner announced that they have fitted the 100th M5 with their HURRICANE power kit. In order to celebrate that, this jubilee model is called the M5 HURRICANE RRs, and instead of 800 HP (588 kW) the engine has been optimized even further to deliver in extra 30 horses for a total of 830 HP.
Based on what G Power wrote in their press release, the HURRICAN RRs also produces 780 Nm of torque, figures which will help it rocket from 0 to 100 Km/h in 4.3 seconds (0 to 200 and 300 Km/h in 9,1 and 25,2 respectively).
Its top speed is 372 Km/h, and the rest of the vehicle’s upgrades, apart from the now famous BI-Kompressor „Sporty Drive“ supercharging system also include a coilover suspension, a set of 20 inch SILVERSTONE DIAMOND wheels and high-performance brake (ceramic brakes are optional).   

Source: G-Power