Put the file within the Sauber Folder (sa2) and override!
This is a quicker skin I put together, it will definitely under-go changes over-time as I figure out the Sauber skin layout in the editor.
If you have suggestions, give them!
Andretti Formula E Livery (Sauber) V 1.1
Andretti Formula E Livery for the in-game Sauber team, will probably under-go some changes soon.