The 2005 Chrysler 300C harks back to the past for its inspiration--a modern Hemi OHV V-8 engine that displaces 5.7 liters and makes a bodacious 340 horsepower and 390 lb-ft of torque. Mated to a five-speed automatic transmission, it gives the 300C a surprising turn of speed. The Hemi is fitted with Chrysler's Multi-Displacement System (MDS), enabling it to transition from eight- to four-cylinder operation to conserve fuel. Smartly programmed, the switching is transparent to the driver, giving 10- to 20-percent fuel savings with no apparent downside.