"The GRU [Soviet/Russian military intelligence] knows that the Italians have very good brains, the brains of great inventors." - - Suvorov.
From the David Irving book: "THE RISE AND FALL OF THE Luftwaffe
The Life of Field Marshal Erhard Milch" this extract:
"Reluctantly, he [Milch] now had to give up all hope of manufacturing Professor Gabrielli’s exceptionally fast piston-engined fighter, the Fiat G.55, in Italy."
That Fiat G.55 an Italian pursuit propeller-driven warplane superior to any German model of the period analogous to the American P-51!
"The Fiat G.55 . . . was a single-engine single-seat World War II fighter aircraft used by the Regia Aeronautica and the A.N.R. (Aeronautica Nazionale Repubblicana) in 1943-1945. It was designed and built in Turin by Fiat. The Fiat G.55 was probably the best type produced in Italy during World War II"
NOT necessarily merely exceptionally fast BUT also superior in handling capability and most so when operated at higher altitudes. AND ALSO the best Axis propeller-drive single-seat fighter of the era.
And this determined evidently as the result of a World War Two [WW2] DACT style exercise.
"The tests began 20 February 1943 with the German commission very impressed by the Italian aircraft, the G.55 in particular . . . the G.55 was also competitive with its German opponents in term of speed and climb rate at high altitudes still maintaining superior handling characteristics. The definitive evaluation by the German commission was "excellent" for the G.55 . . . Oberst Petersen [test pilot?] defined the G.55 'the best fighter in the Axis'"
That Fiat G.55 not produced in sufficient numbers or the German able to transfer the necessary manufacturing capability into the Reich proper in time.
Johannes Steinhoff rated the American P-51 as the BEST fighter plane of WW2. The Fiat G.55 was not far behind however?