Pros--No sped up fast and furious fake scenes... the car was actually performing and performing well.
At the very end, you will note that it is a 69 camaro that hits the catapillers. Flat hood the flys off and the famous louvers before the rear wheel well give it away.
He was trying to beat the clock, which in a sense, was a joke because time ran out.
The original was claimed to do 180 mph and with a 440 six pack and with the right rear gear, I would believe it could do it. When he walks away from the helicopter, that's no bs.
The movie also promoted the awesome capabilities of the Challenger to compete with the other pony cars. The movie did very well in portraying the brute force the Challenger could lay down. Another interesting note, in some desert scenes, it almost sounds like several clips from the movie Bullitt were used as dubs.