I have an 04 4 Runner and was changing the air filter when I noticed a 2nd filter in the top of the filter housing. Unfortunatly I pulled it out only to discover it was permanently attached to the upper housing which costs $287! I am told I have to buy this housing as the filter is not made to be replaced. I checked and my 03 Tundra is the same way. Both are pretty dirty and it seems like they would need to be replaced before they choke off all air flow. Both vehicles have less than 30,000 miles. Any ideas??????