I'll be the first to say it...
Mustang is going down.
Oh by the way, that Challenger will be the first car to recieve the brand new 6.4L(yes!) HEMI, rated at 505 horsepower. Suck on that Mustang! And this time, people wont be comparing a full-size four door to a mid-size coupe. I'm going to be riding high for a while. I'm gonna love seeing the 5.7L Hemi dominating the GT. And then the SRT, and then the SRT-R, and then the V6 battle.
Put simply, the new Challenger will P3wn the Mustang. The Challenger may be a bit more expensive, but meh. Who cares if you have the faster AND better looking car?