I've read that before, about the dubbed sound. It's crap. A lot of the driving noises came from the mic they had installed along the firewall right behind the passenger exhaust manifold. I saw a few interviews on A&E years ago & they interviewed McQueen & several other people involved in the making of Bullitt & LeMans. One of the interesting things was that no trick photography or editing was done in either movie to achieve "special" scenes or sounds. IMO, that's what makes those older car movies so much better than, say, the new Gone in 60 Seconds. It looks & sounds realistic, not computer generated or perfected with re-editing.