This mod replace lots of the game sounds by WWII-related sounds, especially vehicles (cars, tanks, trucks, bikes, planes (jets, rockets and propellers)), weapons, and other minor sounds (car doors, horns, tires, starter).
It is made for GTA version totally dedicated to WWII, as it replace quite every car, weapon, etc, sound of the game. If you just have few WWII tanks or planes, don't use this mod, or just a few sounds.
Sources: Most of these sounds have been recorded from various games, including Call of Duty: World at War, Call of Duty 3, Mafia, Mafia II, The Saboteur and DRIV3R. The others (especially the planes sounds), were originally made by
Tiger33 for his sound mod for IL-2 Sturmovik: 1946. Since these are the best plane sounds I found in games, I asked him if I could use them for my mod, and he agreed. Thank you so much!
Preview (short version):
Long version (warning 30 min long!):