I've been doing a lot of 109 flying lately, discussed in
this thread. The techniques used are rather different from those of the P47, for example. Stealth is the key! Often the way to get a kill is to zoom up behind the bogie in his low 6. But on at least four occasions in the past few days, the bogie has made a break turn just as I was getting within range to take a shot, at a time when he had no friendlies that could have given him a 6-call.
And now I know how he does it. In the SOUND options within Set Up, he has his own engine sound muted to barely a whisper. That way he can HEAR a bogie as it gets dangerously close. Clearly this is a
game-the-game wheeze. The real pilots of WW2 did not have the option of muting their engines. When the 109 is chasing a P51, it can take longer to catch up owing the the P51's speed. This means that the 109 will be lingering in his low 6 for many seconds. If the P51 has his engine muted, this gives him an unfair advantage.
If the game is going to allow the muting of engines, then the engine sounds of ALL planes/vehicles should also be muted - cons, friendlies and his own alike. There is
no way the pilot of a real WW2 plane could have heard the engine sound of an enemy 400+ yards behind him.