they did it to be funny. the person in the passenger seat drives a 73 charger with a 383 and the person recording the video has a 70 charger that screams and a tiburon. it's just funny to me. lol. they did it completely as a joke.

http://youtube.com/watch?v=IbCilNWIJOE

also check out some of his other videos. some are pretty cool. in a rice way for a couple and one or two because it's a badass charger.