I'm looking for a very noticable horsepower gain. Will headers do it for me? And I'm having trouble finding headers for the 2004 f-150 with a 4.6??
Any sugguestions??

 

This is the Dyno from my truck. I have the Jba Shorty Headers and a SIDO JBA rear exit exhaust. I picked up a noticable amount of HP and TQ. The seat of the pants test passed with colors. Check out my sig.....Can you do that with your 4.6 and 3.55 open gears? They made the headers from my truck, so I was the first 4.6 new body to get them. They are available just about anywhere. In fact, I think even troyer distributes them, or try jegs or just go to JBA's site.


If you need more info, try anyone of these threads:
https://www.f150online.com/forums/sh...d.php?t=212038(pictures included)
https://www.f150online.com/forums/sh...d.php?t=220855(magazine article)
https://www.f150online.com/forums/sh...d.php?t=209881
https://www.f150online.com/forums/sh...d.php?t=210864
https://www.f150online.com/forums/sh...d.php?t=228077