I don't like exaggerations.
The P-47M does NOT make 375mph OTD in WEP.
The F4U-4 goes about 350 OTD without WEP. The P-47M goes about 338.
The P-47M does NOT climb at close to 4,000 fpm.
The P-47M does NOT out-turn Spitfires.
How about some actual test data?
Climb to 10k from dead stop on runway, in minutes, seconds and hundredths of seconds. 25% fuel, 6 guns with 267 rounds for P-47s.
P-51D: 3:14.47
P-47D-40: 3:00.88
P-47M: 2:50.56
F4U-4: 2:48.44
Nearly a dead heat between the F4U-4 and P-47M.
Speed at Sea Level
F4U-4: 375 mph
P-47M: 368 mph
P-51D: 367 mph
Advantage F4U-4. Nonetheless, all are damn fast on the deck.
Speed at 5k
P-51D: 387 mph
P-47M: 385 mph
F4U-4: 380 mph
Advantage P-51D, with the M breathing down its neck. The F4U-4 falls behind at this altitude.
Speed at 10k
P-51D: 407 mph
P-47M: 402 mph
F4U-4: 398 mph
Again, advantage P-51D, with the M 5 mph slower and the F4U-4 falling behind again.
Speed at 15k
F4U-4: 420 mph
P-47M: 419 mph
P-51D: 410 mph
Another virtual dead heat between the M and the F4U-4. The P-51D suffers from falling MAP until 17k, where the supercharger changes gears.
Turn Radius at 500 ft ASL, clean (no flaps).
F4U-4: 691 ft
P-51D: 777 ft
P-47M: 779 ft
Advantage F4U-4. The P-51D and P-47M are too close to make any difference. Both the M and the P-51D can drop a notch of flaps at high speed, tightening up their turn. The F4U-4 cannot drop any flaps until much slower.
Turn Radius at 500 ft ASL, full flaps.
F4U-4: 428 ft
P-47M: 579 ft
P-51D: 633 ft
The F4U-4's "wonder flaps" make the big difference here. The P-47M out-turns the Mustang without any drama.
As you can see, the P-47M is very competitive with the F4U-4 and P-51D. However, being a high altitude fighter, 15k and below is not its element, which only amplifies its performance in this comparison. Only in a low-speed, flaps out furball does the F4U-4 show any marked superiority. Above 25k, the P-47M is superior to every prop fighter in the game.
My regards,
Widewing