check this site out before you install your air filter http://www.timskelton.com/lightning/race_prep/reliability/cold_air.htm
some good points about iddy biddy mods without the right tuning. Suggestions like "I have yet to see any reliable data demonstrating any power gains on a stock engine from the addition of a cone filter (which makes sense--why would Ford choke its highest-output engine with an inferior air filter?".
Was ready to do the step by step upgrades, but advice from local tuners was to do the combo upgrades with the proper tune instead of adding single bolt ons without the tune. just my 2cents.:beer: