Today at the North American International Auto Show, Jeep announced a new version of its Grand Cherokee SRT. The company has made some key improvements to its performance SUV – everything from ...

The Grand Cherokee SRT and Trackhawk, are Jeeps most souped-up trims, but the key differences between the two isn't what you can see on the outside.

Awe-inspiring powertrain Powering the 2013 Jeep Grand Cherokee SRT8 is the 6.4-liter HEMI® V-8 with Fuel Saver Technology that delivers 470 horsepower (351 kW) and 465 lb.-ft. (630 N•m) of torque.

SRT engineers bored out the 5.7-litre Hemi 3.5mm to 6.1 litres, increased the compression ratio from 9.6:1 to 10.3:1 and gas-flowed the cylinder heads with bigger, hollow valves (sodium-filled on ...