^^Or as good as some of the Bullitt chase was, the stupid double clutch 21 speed gearbox^^ WHICH WAS RE-used in several other movies and TV shows, SOME OF THEM automatics!!!
The sound of the Mustang was obviously dubbed in. I read a couple yrs ago that it was a GT40 soundtrack.
When the movie Bullitt was about 10 years old, one of the Mopar magazines interviewed the stunt drivers from the film and they said the Mustang was so slow they had to beef it up with headers, rear gears and I think an early NOS system. (Back in the day, I street raced a 68 390GT with my lowly 273 Commando/4 speed and beat him. Thise things were stones) Also things were breaking on the Bullitt Mustang from the rough treatment and they had to keep repairing it. They said the Charger was a far better car and could run circles around the Mustang. Count the number of hubcaps flying off the Charger. I have boxes of old car mags in my basement under the stairs and I'm sure the mags are there.
Also an article on the American Graffiti cars and 2 Lane Blacktop in a Street Rod mag. The 55 in those movies was the same car. The studio had it built by a CA hot rod shop and they took it to a local strip when they were done. It was a legit 10 second car. Nothing fake about it.