You can download Audi RS4 Avant from here : https://play.google.com/store/apps/details?id=lamborghini.wallpapers.CarWallpapers.CarSounds There are thousands of audi wallpapers and it is the best android car wallpaper source especially for Audi wallpapers.
Some popular audi wallpaper categories in the app like
Audi RS3 wallpapers
Audi RS6 wallpapers
Audi TT wallpapers
Car Wallpapers 