Air purifier 08GTS

I'm getting a service due notice that is for the Air purifier filter on the Air Conditioning system.  I would like to know where this thing is located and how to service it. 
 
I called the dealer and they want $40 for the filter and another $40 to install it.
 
Any information would be greatly appreciated.

Me too I want to know where is located I look thru the Glove Compartment bottom part but I only see a foam.
 
I want to change my Filter because my car smell like Skunk after heating 2 of them last winter.
 
Anybody!!!

The Cabin Air Filter is Behind the glove box front seat passenger side.
 
Removed the glove box and after that, the filter case should be on the top of the blower and you may use a knife to open the filter case. the case will split 2 cover you can pry them with a knife and replace the cabin filter with a new one.. reinstall everything.
 
filter will cost 20 buck or a little more
 
easy steps

here''s the site it is for Evo forum but I think all Mitsu are design the same components except for the Engine
 
http://forums.evolutionm.net/showthread.php?t=85222

it costs me under $10 at www.logical-source.com
and it took me less than 2 minutes to replace it. http://www.qualityplusauto.com/CAF/guides/8106P.pdf