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.

The Durango R/T packs a 5.7-liter V-8 engine that puts out 360 hp and 390 pounds-feet of torque, while the supercharged 6.2-liter V-8 propels the 710-hp Durango SRT Hellcat with 645 pounds-feet.