Here is how to determine the HP needed for 200mph for any specific vehicle on any specific track...
Determine the HP needed to go 100 mph by going at a steady 100 mph on fairly level ground (two way runs and average the number to cancel out wind effect and ground unevenness))
All that is needed is the "Absolute Manifold Pressure " and rpm.
Go to a chassis dyno (steady-state type) and duplicate that power level, then multiply by 8,,,,,,,DONE!
Examples: If a motorcycle takes 60 hp to go 100 mph. Then 8 X 60 equals 480 hp to go 200 mph
If a pickup truck requires 150 hp to go 100 mph then 200 mph would require 8 X 150 = 1200 hp.
Have fun but be safe,
Robert "Smitty" Smith
Red Baron LSR