There`s a 2009 Challenger 6.1 here in Va.Beach that has twin turbos and runs 10.teens. I believe the owner is a member of the Tidewater Mopar Club. The car weighs in just under 4000 lbs. and appears as any other 2009 Challenger.
I had the 4.7 in my Dakota and it scooted pretty good for its weight. It also got over 20mpg on the highway. I think it would be a cool transplant if you can find a deal on one.