740i and 740Li models get a 315-horsepower, 3.0L inline 6-cylinder engine and an 8-speed automatic transmission. The all-aluminum engine has twin turbochargers, variable-cam technology and direct injection, all of which help it produce strong torque output at low revs--a full 330 pound-feet from 1,600 rpm. These models now feature available xDrive, which helps improve on-the-road traction and stability and normally sends 60 percent of power to the rear wheels.
