There hasn't been much discussion about regular replacement engine air filters, most of it has been about replacing the whole stock intake with a CAI or short Ram.In addition to buying a filter from etiher a Toyota or Pontiac dealer, you can also get filters fromWix (
www.wixfilters.com) PN 46834 Purolator (
www.pureoil.com) premium plus PN A25463Although those ***************** at Fram don't list either the Matrix or Vibe on their website at
http://www.fram.com, they do list corolla, and the engine air filter for a corolla is a CA9482. On the wix site, that fram part numbner cross references to the wix part number above, so Fram CA9482 should work.Same stock filter for base and GT. I haven't priced any of theseCan usually get Wix and Purolator filters from auto parts stores, Fram at Walmart.And yes, it is easy to replace the stock engine air filter --------------------------A thread about the cabin air filter is
http://forums.genvibe.com/zerothread?id ... ---ANybody know of any other web sites for looking up filter part numbers?