I came across these links trying to find out exactly how to pop in a K&N filter before taking a peak under the hood and came across these files, they are factory service manuals with thousands of pages of pdfs enjoy!
http://www.ezdries.net/Vidpics/4Runn...%204Runner.zip
http://www.ezdries.net/Vidpics/4Runn...pairManual.zip