I'm going to guess
-Mercedes Benz SL Lorinzer, AMG, Braubus (Aftermarket Tuner)
-BMW M5 Alpina (Aftermarket Tuner)
Although, in the pic of the front you can see the bottom of the bumper. Its too rounded to be those above cars, the profile sure resembles them. The front bumper kinda looks Porsche-ish..