The Dukes really had some wild stunts in it, but Bullitt was great. There was a tech article published in a couple mags about the cars. It seems the Charger was a stock 440 4bl, & the Mustang a 390. (BIG weight advantage for the 'stang) But the Mustang would not keep up,so the Charger had to keep waiting. So they had the engine done in the Mustang (I think Smokey Yunick, not sure), but they spent more on the engine in the 'stang than the Charger cost, & it still wouldn't keep up. I'm not surprised, are you?? Still, it was a really fun movie. Sorry Mustang guys. Ovmf