[SubyTechJoe]

Call your dealer with your VIN# and see if Service Bulletin WWW-07 applies to your vehicle. If it does not you will need to purchase Air Filtration Conversion Kit PN #SOA342L500 BTW if your car is not affected you may ask the dealer to take a look and see if it is easily serviceable. The kit may already be in place.

 

[SubyTechJoe]

The kit actually adds a hole, a curtain for the hole, and an "L" bracket to keep things in the glove box from falling thru the curtain and into/under the dash

 

[tdelker]

Here's the most complete thread on the air box mod:

http://legacygt.com/forums/showthread.php/installation-cabin-air-filter-56k-warning-1626p24.html

Note: May people just cut a hole in the back panel if you are a DIY type.