Do you have a musty odor in your vehicle? Do you have allergies? Is your vehicle exposed to a large amount of road dust? Try changing your cabin air filter for cleaner air inside the passenger cabin. Manufacturers recommend every 12 months or 12, 000 miles. In areas with higher pollutants in the air, you may wish to change the cabin filter twice a year. This Cabin Air Filter has carbon-impregnated media to help neutralize odors and keep your car's interior air smelling fresh. ECOGARD XC10314C COMPATIBLE WITH: Porsche 911 3. 4L 1999-2013 Porsche 911 3. 6L 1998-2012 Porsche 911 3. 8L 2005-2013 Porsche Boxster 2. 5L 1997-1999 Porsche Boxster 2. 7L 2000-2013 Porsche Boxster 2. 9L 2009-2012 Porsche Boxster 3. 2L 2000-2006 Porsche Boxster 3. 4L 2007-2013 Porsche Cayman 2. 7L 2007-2008 Porsche Cayman 2. 9L 2009-2012 Porsche Cayman 3. 4L 2006-2014