I have an AT 2011 and both are closed, but I purchased a drivers side front fog light trim piece with the holes open to allow air to pass into the engine bay. This inlet is right under my SRI so it gives a ram air effect, diretly behind the vent in my car is just a metal wheel well housing at a diagonal which will direct some air upwards. I may install a fine screen behind it to keep dirt out of the engine bay, and on my car the transmission cooler is eith relocated to the radiator or just not there, I'm going to put another one in there to increase the life of my transmission. There is no factory part for the passenger side with the vent holes. I got mine from onlinemazdaparts.com