I doubt an F1 car can be going 175 mph before the kink, let alone a cobra. You can't get to those kind of speeds before the kink, not enough track distance.
The fastest place on that track, usually for a cobra is the front straight. The down hill into turn 5 is to spooky to stay in it until the last minute. The kink is too scary to go as fast as you can through there in any car let alone a cobra.
160 mph is very impressive in a 230hp car. The link below is maybe 170 mph in a cobra with 600+hp. It is the funest track I have driven in a cobra.
http://www.youtube.com/watch?v=95E9B6zPzuY
Scott