Cool - I got to shoot some video footage for a station I worked at crouched up in the "passenger" section of a car. Needless to say it was not at speed, but it was some good footage and a fun time for me.
We only did about 160mph (I've hit 145 myself) so the speed wasn't anything crazy. But the grip of the car was phenomenal. No brake into the second turn. We got held up by some people driving (you could ride or drive) so my driver swooped past them nice and close and gave me an extra lap.