We took the cobra out last evening (an original 427, not a kit car!) and I had one of my cameras on me. Mind you I didn't have my proper gear, so I rigged the gh2 with only two suction cups instead of the usual three. You'll note the resulting wobble!
I used the lavalier mic I had with me in the lower part of the cockpit out of winds way, ran directly into the gh2. With the gh2's gain turned all the way down, it still clipped the whole time! Yes it's a loud car, but the lav is a hot mic and the gh2's audio gain isn't the most adjustable thing in the world. Next time I'll have an in-line pad on me.