Razor and I have dabbled in the various "jet packs" for IL-2...and to be honest, they are lacking quite a bit. In my opinion, we have stretched the engine as far as it will go with Korean era planes, which are already part of your AG-51 pack (thanks Hoss!).
If you want to try enabling various mods, I can help get you started, but you will need three things:
Hard drive or storage space (60 gig installs are routine, and you'll need several)
Patience (shit breaks constantly, or is incompatible, or just plain doesn't work)
Adult beverages (something to kill the pain)