This is Red Mist's car from the upcoming Kick Ass movie. Started working on it thinking "oh, this should be easy" and ended up taking forever. Think it turned out OK.
From what I've read, this is a Mustang body with a 650 hp Saleen engine built by the "Pimp My Ride" guys. See reference: [link]
Credits: Marvel Characters Inc.
Plan B Entertainment
Galpin Auto Sports