From Car and Driver instrumented tests...
Mustang GT500: 0-60 3.5 seconds, 1/4 mile in 11.8 @ 125 MPH
Challenger Hellcat: 0-60 3.6 seconds, 1/4 mile in 11.7 @ 126 MPH
Mustang: 662 HP, 631 lb/ft torque @ 4,000 RPM
Challenger: 707 HP, 650 lb/ft @ 4,000 RPM
"Back in 2010, Ford was crowing about its 550-hp Shelby GT500. Chevy one-upped that in 2011 with the 580-hp Camaro ZL1. A few months later, Ford didn’t so much leapfrog Chevy as it did stomp its face into the mud as it ran away with its girlfriend and its mother, introducing the 662-horse 2013 GT500. Now Dodge officially ushers in the age of unreason with the 707-hp 2015 Challenger SRT Hellcat.
Dodge quotes an 11.2-second quarter-mile on the tacky surface of an NHRA-certified drag strip, but the Pirellis feel so overstressed that hitting that low ET would also require dropping tire pressures to about 10 psi. (We always conduct our acceleration tests at the manufacturer’s recommended tire pressures.) At higher speeds, though, the Hellcat runs away from everything in its price range. It hits 150 mph in 17 seconds flat, 0.8-second ahead of the Viper and the same time as we recorded from the quickest C6 Corvette Z06 we ever tested. Indeed, it out-accelerates just about every front-engine, rear-drive car we’ve ever hooked our test gear to. Improving on this car’s acceleration would require moving the engine behind the driver—and preferably sending power to the front wheels, too."