This is a mod, which will add classic f1 sounds for the game. Copy the files to Program files\Steam\Steamapps\common\F1 2014.
I haven´t changed the files at all, so this is just a copy, rename and paste action.
Please make a backup, just in case if you want old sound back!
P.S.:Exterior sounds are still old, because you can´t change them(you will notice that in chase camera view)