I want airshow sounds like in this guy's video
http://www.vimeo.com/user630665
choose the Ultimate Sound Mod V2 la suite and Ultimate Sound Mod V2 videos. They are pretty hefty so it may take awhile.
caveat: it says mod, but I'm just using these vidoes as an example of what can be done in IL-2 (and not including links or anything) but if its illegal, let me know . . .
I don't take credit for this discovery (it was floating around M4T and Ubi Zoo).