Right before I get heavily slated for doing serious speed. Please read the following: I have a friend who owns a private airbase who likes cars and we were doing some high speed runs on it last night to see how fast we could go. The cars were on private property and therefore no speed limits applied. Right now I have that out the way I was driving along. On my tomtom I reached 163mph when my bonnet open warning light came on. I instantly started slowing down through fear of the bonnet flying off but was interested in knowing if anyone else has had the same issue. When I got the car under 140 the light switched off and everything was fine. Got out and looked to see if the bonnet had bent or buckled or anything but doesnt look like it has. What is the possibility of the bonnet "flying off" at this sort of speed. I thought I would ask the question but to anyone who just wants to reply and say "you shouldnt have been doing the speed" please don't reply. I knew the risks I was taking and was on my own doing the "test". Thanks.