P-400s were used by American pilots in North Africa, mainly for ground attack. Because they had no turbosuperchargers, they were handily outperformed by the 109s and 190s, at higher altitudes.
However, any Luftwaffe fighter jock foolish enough to tangle with them at low-altitudes was in for a shock, for the P-400 could outmaneuver both enemy fighter types. Several American pilots, when jumped at low level by 190s, simply reefed their mounts into a tight turn, and spun in their opponents.
If jumped by enemy pilots with an altitude advantage the P-400s were almost helpless, if the enemy employed boom-n-zoom tactics. One flight of 15 American fighters was jumped at low-level and lost nine of their number. The five that survived, simply firewalled their P-400s and left the German fighters behind, outracing them on the deck.
Regards, Shuckins