BMW's current 6-Series coupe. Image: BMW The twin-turbo V-8 that BMW uses in the new 750i and 6-Series Gran Coupe makes 445 horsepower and 480 pound-feet of torque. That?s a significant jump from the 400 horsepower and 450 pound feet of torque produced by a variant of the same 4.4-liter V-8 in BMW?s 5 and...
