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/4Runner Repair Manual/Repair Manual 03 4Runner.zip
http://www.ezdries.net/Vidpics/4Runner Repair Manual/2006Toyota4RunnerRepairManual.zip
http://www.ezdries.net/Vidpics/4Runner Repair Manual/Repair Manual 03 4Runner.zip
http://www.ezdries.net/Vidpics/4Runner Repair Manual/2006Toyota4RunnerRepairManual.zip