Originally Posted by ausdude

The 2013 550i's fuel saving electric steering system has been replaced with a hydraulic unit, and the M-specific speed-sensitive Servotronic arrangement can be adjusted to one of three different settings. The steering now feels quite natural.

This car also got a new engine, rated at 445 horsepower and 480 pound feet of torque. That’s a gain of 45 horsepower and 30 pound feet of torque compared to last year’s models, courtesy of BMW’s Valvetronic variable valve timing system.

http://www.autotrader.com/research/a...013-bmw-m5.jsp