[Ted@MPSC]

The interior of the vehicle is reffered to as the passenger cabin area. This is a filter to reduce the intake of pollen and dust into the passenger cabin.
The people who purchased base, and touring editions more than likely do not have a cabin filter. This is a complete filter housing, cover, and filter that is sold much less than purchasing the filter alone. If this were just a filter, the shipping would be around $5.00, but the housing is fairly large, so that brings up the shipping charge some. If you live in areas like I do, the upcoming pollen season is terrible. Black cars turning yellow due to the Pine pollen. This filter is a big help for people with allergies in reducing the pollen intake from the outside air into the cabin area.