The upcoming BMW M5 Twin-Turbo V8 runs a modified S63 engine - the same power plant used in the X5 M and X6 M - cleverly packed into the sedan's racing inspired chassis. It produces roughly 578 horsepower and 530 pound-feet of torque. Early reports clock the car at less than 4.4 seconds for the 0-60, with an electronically limited top speed of 155 mph. The new flagship M5 gets an even lower and more sport-focused M-specific driving stance, galloping on 20-inch alloys. Also new for this model is an Active M rear differential with variable torque split. And of course, paired with all the muscle, the new M5 Twin-Turbo V8 is dressed to kill - it is after all, a gentleman athlete. So in short, while the last thing this new BMW needs is a audio/video ode to it's refined performance, that is exactly what BMW has given it. In two minutes, BMW captures the car's unique engine roar - not the most brutal Munich has produced, but quite an baritone nonetheless. And the car is put through it's paces just a bit too, showing the fun potential provided by the rear differential. Check out the video of the Euro-spec 2012 M5 Twin-Turbo after the jump, and stay tuned for release info.