I was watching a bunch of videos that this guy did (Martin built on YouTube) on how to add more power to the 4.7l. I know there's not a lot out there anymore for these engines but, he shows you how to modify & ad things to earlier (99-07) 4.7s & it's pretty good stuff. I was an auto mechanic for over 35 years, so I can relate to his upgrades. Check them out.