Here is an early review of a pre-production SRT Challenger:

http://www.popularmechanics.com/auto...s/4248065.html

Excerpt:

"Even the ear buds we were wearing under our helmet to maintain radio contact with the pits couldn't muffle the baritone exhaust note from the big, 6.1-liter Hemi whenever we put our boot on the pedal. You should understand that we were toeing the accelerator extremely delicately, picking our way around a slippery, 3.1-mile track at a rain-sodden private track here. On the few occasions we could let the new coupe extend itself, the 425-hp Hemi gave voice in a way that brought a smile to everyone in range."