Nuts! Fastest I ever went was in a Porsche GTR2 on a German Autobahn. Pushed it all the way to 300 kmp/ 186mph.
My buddy over there owns a body shop and always has some exotic cars in the garage to take for a ride. This Porsche was one of a kind vehicle. Estimated price of around 1 Million, all wheel drive and 800 some ponies. This was a afternoon I'll never forget.