In this folder are all the cars of the game found. You can place the ini in the correct subfolder and they will appear in game.
I've tried the following with the Ferrari 459 ini file and the BMW GT2 ini file - It doesn't appear to be showing the setup in the game. it is still only showing me the default setups, am I doing something wrong?
I have tried restarting AC and the PC itself and still no good.