Was just at the Mopar Springfling in Mississauga, Ontario Canada and MOPAR had a display Challenger with a very cool stripe.
CHECK IT OUT:
http://www.youtube.com/watch?v=1hcJZtHi6H8
Apparently it's an official MOPAR piece - part number 82211880 for the black version. They also said there is a silver version.
I like it a lot. I always find that factory designed graphics work with the design of the vehicle better than aftermarket. But that's just me.