Sorry but you're wrong, because wind sounds are only heard by the pilot. From the ground, for instance, it really makes a difference but only if it is part of the engine sound.
If wind sounds are only heard by the pilot, why are you mixing wind effects with engine effects for external sounds? Also keep in mind that my mentioning mixing the whistle effect with the wind sound file was meant for
in cockpit internal sound. Again, mixing the scream/whistle with the wind sound is preferable for that purpose, as I said before.
Bear in mind that the "scream" effect is
only heard at speed; speed at which that wind rustling can be heard. If you were to run a P-51 (or Spitfire or any other aircraft equipped with a Rolls Royce Merlin) on the ground through its full power band, you would never once hear that wonderful scream, because that sound is caused by the airframe pushing against the atmosphere and the
wind blowing through the intake.
Why do you think the Japanese dubbed the F4U Corsair "Whistling Death"? Oh yeah, never mind. You can only hear wind sounds from inside the cockpit. I think you mean the more rustling kind of effect one hears inside the cockpit.