Building on the new Chrysler 300 Sedan unveiled last year, Chrysler unveils the new SRT8 version of the venerable 300 sedan at the New York International Auto Show, heralding a new heir to the great SRT line up.

SRT stands for Street and Racing Technology, and gives the Chrysler 300 a thorough workout, with a new V8 engine, visual tweaks and improvements to the driving dynamics.

Under the hood of the 2012 Chrysler 300 SRT8 debuts the new 6.4-liter HEMI V-8 makes its debut, promising an estimated 465 horsepower and 465 lb.-ft. of torque, up 40 horsepower and 45 lb.-ft. over the outgoing 6.1-liter HEMI V-8.

Projected performance numbers include 0-100 km/h acceleration at around the 5-second mark (0-60 in the high 4-second range), with a quarter mile time in the high 12 second range and a top speed of 282 km/h.

Chrysler also claims an an estimated 25-percent fuel economy increase on the highway is achieved by use of a new for 2012 active valve exhaust system that allows the standard Fuel Saver technology (four-cylinder mode) to engage over a wider rpm range. The new active exhaust system also allows for straight-through mid and rear mufflers for a throaty exhaust note under engine load.

New for 2012 is an Adaptive Damping Suspension (ADS) system that is tuned specifically for the Chrysler 300 SRT8 to offer a compliant and comfortable ride when needed, and stiffens up when demanded.