I've seen a piccie of an old M5 at 155 - I guess you could do it byDuct Taping the camera to the wheel and using a cable release to take the pic without taking your hands of the wheel.
The Top Speed Straight is the place to do it - I've seen 140 going up in the car, and 165 going down on the bike, but the bike speedo reads about 10% over so nearer 150.
You'd have to get rid of it pretty damn fast in case you got pulled though - people have been done when the peegs played back their nice incriminating video footage.
