I found these in 3d warehouse and decided to convert them to .cgf format. The textures are pretty low res and they are not destructible. If somebody wants to make them destructible I can give you the .obj file for these vehicles.

Original files made by Antics:
Firetruck
Police car

Credits:
- Antics

Features:
- 2 new vehlice objects
- Custom textures
- Easy PAK install

Installation:
1.Go to your Crysis game folder -> Electronic Arts -> Crytek -> Crysis -> Game.
2.Copy the downloaded zz_***.pak file into the current game folder (Game).