If I'm reading correctly, the C7 should have the same bottom 4 gears as the current GS so think it'll be held to under 200. Even though it's probably slicker from an aero sense, the spoiler is a drag
and 450 hp is probably not enough to push it all the way over 200. Some members over on CF were whining that their Z06s wouldn't get over 176 at Talladega. Not sure you could find too many places to run faster than that.........