The top speed for this plane currently in-game is 400 knots. I assume this is based on the Wikipedia page's stats section. (it also doesn't seem to be citing any sources, but I'm not trying to say it's incorrect.)
The thing is, the same article also says that the FAI lists it as the world's fastest propeller-driven aircraft at a top speed of 500.8 knots. In the Wikipedia page for "fastest propeller-driven aircraft", it also repeats the same claim, followed by the fact that the previous record holder was the Tu-95 at 499 knots. The Wikipedia page for the Tu-95 also lists its top speed at 499 knots. In Aeronautica, the top speed of the Tu-95 is 497 knots.
Now, I assume (correct me if I'm wrong) the 400 knots figure in Wikipedia is meant to be the top recommended speed for cruising, as opposed to the actual maximum possible speed (as in the 500.8 knots speed record). But I think it should still be capable of going at 500.8 knots, or at least much faster than its current top speed, considering that at least the Tu-95's top speed is set to be the record speed instead of its cruise speed.

is this so necessary









