Well today was the day. After seven years I finally replaced the so-called life time air filter on the Focus. I purchased the Dorman after market filter box. Cost $200, but that's half the cost of a Ford replacement. Also the Dorman has a replaceable slide in normal filter. Bad news it's kind of hard to get to for the replacement. Altogether this was a rather hard job as the drivers side inner finder well had to be pulled along with other stuff that was in the way. Took me three hours to complete. Here is a pic of the new filter box.
http://www.oreillyauto.com/site/c/detail...1&ppt=C0023
http://www.oreillyauto.com/site/c/detail...1&ppt=C0023
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