This is not the first time that G-Power has imposed its Madness on BMW's latest M6.
Its first attempt, released last year, raised the game by boosting the standard 412kW/680Nm turbocharged V8 to push 477kW and 777Nm.
Now the German tuner is upping the ante with its Bi-Tronik III V2 that's credited with 522kW and 890Nm. In fact, they're not even bothering to release 0-100km/h performance figures, although they do boast that it'll thunder from standstill to 200km/h in just 10.8 seconds and top out beyond the 300km/h mark.
The main component of this modification is an ECU overhaul, but while any tuner can just boost the output this way, G-Power insists it has achieved a well-balanced, better-quality package than what the competition offers.
For instance, they've managed to limit the torque output during the shifting process to reduce the stress on the car's seven-speed M Double Clutch transmission.
DEEP, THROATY BARK
In addition to the ECU enhancements, G-Power has thrown in a high-flow Titanium exhaust system with output-optimised back pressure and a "deep, throaty sound that turns heads."
The engine mods are joined by a raft of new components that aid the M6's cornering and stopping ability.
The car sits on massive 21-inch G-Power 'Hurricane' alloy wheels clad in Michelin Pilot Super Sport tyres measuring 265/30 at the front and 305/25 at the back.
Road holding is further honed by a continuously-height-adjustable G-Power coil-over suspension system with nine selectable settings for bound and rebound.
To stop it on a dime, G-Power is also throwing in a reworked six-piston braking system and clients can also order ceramic brake discs.