Go find a Focus in a junkyard, and remove the cabin air filter holder. Then you can put a factory cabin air filter in your car. You'll need some stuff to seal it up with, but I'm sure you can figure that out. The best stuff to use would be automotive window sealer which is about $15/tube, fits in a caulk gun, and will most likely only be found at an automotive glass installer, or supplier. There is some stuff you can get at regular parts stores, but it's more like rubber cement.Mike from Hilbish looked up the cabin filter and told me that from 03/04 production and up no cabin air filter was used. Bluefront's modified furnace filter is the way to go for filtered cabin air.