I've had amazing success in P40e vs spits and hurricanes
Granted P40 is slower then fat woman chasing an ice cream truck (im sure the acceleration is about the same)
But flown correctly, i.e BnZ and turnfight when you have to with flaps, it can turn quite well, i've stayed with 109s and spit 16's easily, just cant accelerate with em, and worse you might only have one shot before they try to run.
F4u series is amazingly wonderful for turn and burn, last night took an F4u up and turn fought an La7 and P51D at 15k, granted havent flown an f4u in a tour I had to dive after 5 or 6 minutes of turning simply couldn't get an advantage on either of them.
PLENTY of awesome f4u sticks can vouch an f4u with flaps down can make a spits life pretty hell.