How fast you planning to go 250mph i presume especially with 1250hp faster than a bugatti veyron or twin turbo hennessey viper

There are lots of cooling and aerodynamics issues to consider when modifying a car for 220mph+...in other words, it's not only about rwhp.

I know you have to worry about aerodynamics(lift and drag and a bunch of different factors) and cooling cause the engine gets too hot at high speeds and it is extremely hard to get to that speed, why do companies like maclaron, bugatti,ferrari, and many other companies spend millions on expermenting. The only way to get speed is to have rwhp.