I don't mean to bash down on tigers sound mod. But to me, the flyby's are the feature that ruin the soundmod. It's a flyby sound from an airshow that just loops each time you press F3. Doesn't feel like the plane in game is producing the sound, it feels like it's just being there as a placeholder. Personally I'd like to have sounds that are created by the game. Much like FSX, depending on angle you're viewing the aircraft, speed, rpm, supercharger etc.
Not saying this sound is superb, it's quite old but it is showing what I mean about the sound generation method. That it's the angle of the camera viewing the plane that determines what sound is dominant. This video demonstrates the spitfire coming in with a generic sound, then switching over to more of a defined exhauststack "putter" sound as it goes by.
ARMA II is a game that does pretty good at simulating aircraft noise:
Typically you'll hear the more defined jet sound in front of the plane, but in the back you'll hear more of a "windburst" tearing up the air. I know this from working with F-16's too. It's unbearable to stand infront of the F-16 without hearing protection, but behind the nozzle you're fine.
I can only imagine the props of wwII had more defined exhaust sounds behind the plane than infront, especially at high RPM's since sound travels through air and have to work their way through the propwash first.