For me, the scariest part was running out of straight-away on the track and catching the bad air turbulence off of the spoilers from the Viper race car after he passed me. My car virtually floated for a few seconds (which seemed like hours). I don't have anywhere (as in a track) that has enough room to do a top speed run at. I have never hit these speeds on an open highway.
Where did you do your high speed runs? Was the NSX run on an open highway? Have you ever tracked your S2000 or S4 (because they are truly designed for the track)? Where in Canada do you live?
Brad