So do our Mustangs have a provision for a cabin air filter? I took apart my 03 Focus and sure enough it had the slot for one, the owners manual didnt say a thing about it. I put the cabin air filter in the Focus 2 years ago, pulled it out today, ugh, it looked like ass. My Lincoln owners manual said to change it every three years on the Continental we used to own. It sure keeps the dust and pollen out of the interior. Unless anyone knows for sure Im going to take the cowl apart as soon as I have the time, I sure want one if it can be fitted.