I've got to think the drag cant be 40mph less then a 200mph Vett, 160mph mfr drag...has to be insurance based , like they did to 400 +hp cars in the 60-70s,lower rated = less insurance then what about now .
BTW I LUV this video
Nissan 370Z Speed Limit Canceler by Young Motors(390km/h) - YouTube
And yes I know that car can't do this on the road, drag would prevent it .