The high performance C version of the 300 returned unchanged in 2006.  It's powerful and striking appearance had quickly elevated the 300 to the top of Chrysler sales, and prospective C buyers were even placed on a waiting list.  While styling is essentially the same across the 300 line, this trim is marked by what's under its hood.
The 300C is powered by a 5.7 liter Hemi V-8, boasting 340 horsepower and 390 pound-feet of torque.  The Hemi is paired with a 5-speed automatic transmission, and suspension is stiffened a bit beyond some of the other models.  This 300 is tuned for performance.  The 4000+ pound sedan speeds from 0 to 60 mph in 5.7 seconds and through the quarter mile in 14.  Fuel economy is rated at 19/25 mpg, a considerable dip below the V-6 models.
Along with style, performance and power are the most frequently praised attributes of the 300C.  Drivers have commented that the sports tuned suspension, adjusted from the prior Mercedes Benz E-Class, allows for great handling and road awareness.  The higher-priced C adds an abundance of features and options, including a premium sound system, Bluetooth, and park assist.  The build quality of interior fixtures has continued to bring complaints, which are often directed at the flimsy feeling and finicky nature of power controls.